Brookfield Industries NB-4150 User manual

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For All Door Operator Model Numbers
for Swinging and Sliding Doors
SWINGING AND SLIDING DOOR OPERATORS FOR LEAD
SHIELDED DOORS

Brookfield Industries, Inc.
NB-4150
COMMERICAL/INDUSTRIAL
SLIDING DOOR OPERATOR
MANUAL
Side Mount: Single Slide/ Bi-Parting
Top Mount: Single Slide
(7th Edition 11/01/2021)*
*Incorporates Maintained Contact to Close per UL 325, Entrapment
and improved safety relay.
US Patent No. 6,177,771 B1.

Table of Contents
• Important Instructions for Installation
• Important Safety Instructions
• Overview
• Installation Instructions
• Installation Instructions for Emergency Hand wheel
• HMI Instructions
• Door Position Setup Instructions
• Terminal Strip Hookup Legend (Power Supply and Class 2 Voltages)
• Wiring Diagrams
• Parameters for NB-4150 Sliding Door Operator
• Maintenance Intervals
• Safety Systems
• Limited Warranty
• Side Mount Bi-Parting Drawings
• Side Mount Single Slide Drawings
• Top Mount Single Slide Drawings
• Emergency Hand Wheel Drawing
• Sliding Door Operator Troubleshooting

WARNING!
IMPORTANT INSTALLATION INSTRUCTIONS
IMPROPER INSTALLATION CAN LEAD TO SEVERE INJURY OR
DEATH
READ AND FOLLOW ALL INSTRUCTIONS
• Commercial/Industrial Sliding Door Operator shall be installed more than 8’ above the floor
• Install only on a properly operating and balanced door within the rated values for door weight, door width and
operating forces as stated on the ratings label
• Do not connect door operator to source of power until instructed to do so
• This door operator shall be installed and serviced by a qualified technician, electrician or electrical maintenance
person familiar with its operation and the potential hazards involved.
• Any person performing installation or service on this product shall read this manual first. Proper installation includes
following all steps outlined in the Installation Instructions and the settings specified under the Parameters section.
• Assure all electrical wiring and grounding is installed as specified in this manual and as required by any local codes.
Proper installation can also reduce the risk of electrical shock, fire or explosion.
• Locate activation switches or push button stations: (a) within sight of the door, (b) at a minimum height of 5’ so small
children cannot reach and (c) away from moving parts of the door.
• Install the Entrapment Warning Placard next to the activation switches in a prominent location
• As described in this manual, the Stop command controlled by the motor drive is not intended to be a fail safe or
Emergency Stop (E-Stop) since it does not prevent the motor drive from malfunctioning. This can only be
accomplished by disconnecting the AC power to the operator (terminals L1 and N).
• This door operator is to be a permanent or “hard” wired connection to the supply voltage. The electrical contractor
shall install a dedicated breaker or line switch to disconnect each ungrounded pole of the door operator from the
supply voltage. Each ungrounded pole shall have a minimum of 3mm contact separation.
• If this model is equipped with a manual release, disengage pin(s) between door and door operator before manually
moving the door.

WARNING!
IMPORTANT SAFETY INSTRUCTIONS
IMPROPER USAGE CAN LEAD TO SEVERE INJURY OR DEATH
READ AND FOLLOW ALL INSTRUCTIONS
• Commercial/Industrial Sliding Door Operator for trained traffic* use only. The manufacturer of this product does not
include external safety devices as a standard feature.
• External safety devices are required on this door operator. The installer is solely responsible for selecting and installing
the correct safety devices to prevent severe injury or death. Refer to the Terminal Strip Hookup in this manual for proper
wiring and to the owner’s manual of the external safety device manufacturer for proper installation and use.
• No person shall perform any service or activate this door operator unless they have been properly trained in its safe
usage and have read the owner’s manual.
• Never let children operate or play with door controls.
• Before activating this door operator, check the following:
1. Assure that all personnel are clear of the path of this operator and the door that it is attached to.
2. Assure that all fingers, hands, feet, limbs and articles of clothing are clear of all moving parts and pinch points.
• Personnel should keep away from a door in motion and keep the moving door in sight until it is completely closed or open.
NO ONE SHOULD CROSS THE PATH OF A MOVING DOOR.
• Test the door’s safety features at least once a month. Make any adjustments or repairs as necessary and retest. Failure
to do so may cause severe injury or death.
• KEEP DOORS PROPERLY OPERATING AND BALANCED. Refer to door manufacturer’s manual. Have repairs done
by trained technicians.
• Prior to performing any service on this product (including the replacement of any fuses or circuit breakers), disconnect the
operator from the supply voltage.
• For continued protection against fire, replacement fuses or circuit breakers shall be of the same type and ratings as those
being replaced.
*Defined in ANSI 156.10 as a controlled group of people trained in the safe use and operation of a particular door installation.
SAVE THESE INSTRUCTIONS

Overview
The NB-4150 Sliding Door Operator (Single Slide) is designed and tested for lead shielding
doors weighing in excess of 100,000 lbs that require a maximum operating force of up to 1800
lbs at maximum speeds of 8.5 inches per second. The NB-4150 can be modified for Bi-
Parting applications providing the operating force on each door does not exceed 900 lbs
(supplemental drawings available upon request). This is accomplished with a linear drive
system comprised of a 3” wide XH polyurethane steel reinforced timing belt coupled to a 3hp
AC, high torque, in-line helical gear motor.
The NB-4150 is designed to be used in conjunction with an existing linear track system
capable of supporting heavy doors with a low coefficient of friction. The open ended
style timing belt clamps directly to the top of the door. Once the timing belt has been
properly aligned and pre-loaded, in addition to the motor control parameters being
correctly set, the NB-4150 will provide many years of maintenance free service.
This power open/power close electro-mechanical operator with its state of the art
components, make it the strongest, most reliable and easiest to install in the industry
today. Refer to the Wiring Legend for Terminal Strip Hookup for all open, close, stop
and External Safety Device inputs, which are all Class (2) 24VDC normally open
momentary contact (except the stop input, terminal #10, which is a normally closed
input). Power supply hookups for both Class (2) 24VDC, and 230VAC,3 phase are also
indicated. The PLC then processes all this information, in addition to many other
features for proper control of these heavy lead or concrete doors. This door operator is
patented under US Patent No. 6,177,771 B1.
The NB-4150 Commercial/Industrial Sliding Door is compliant with UL 325 Section
30.2 External Entrapment Protection (Fail Safe/Self-Monitoring) providing all
External Safety Devises are wired and installed per this manual.
Logic Control:
This Operator offers the latest technology in PLC (Programmable Logic Control). The
following (3) modules snap to a DIN rail base:
CPU (Central Processing Unit)- processes and stores data in its internal register such
as door position presets, inputs from pushbutton stations and outputs to motor controls.
This extremely compact unit houses (8) LED 24 VDC inputs and (6) LED outputs with
(3) isolated commons.
Analog/Digital Converter- converts the analog signal of the Rotary Position
Transducer to a digital value.
Class (2) 24 VDC Power Supply- converts 110 supply voltage to Class (2) 24VDC
power to operate the CPU, A/D converter, Rotary Position Transducer and presence
sensors.
These plug-in modules with LED make diagnostics and replacement of parts easy and
quick to perform.
Interface with the PLC is necessary to adjust Door Position Presets in the field. This
is accomplished by plugging in an 8- Pin Phoenix connector to the back of the Data
and a round female connector into the side panel of the operator.
The is a hand held, touch screen device that is purchased separately.
HMI
Access Unit (HMI)

The CPU has been programmed to adjust on the fly, such door position presets as
Back Check, Full Open, Latch Check and Full Closed.
Input commands to be processed by the PLC, are done so by making the appropriate
connections on the Terminal Strip Hookup. By connecting a separate normally open
SPST switch between terminals 1 and 14 to open, terminals 1 and 13 to partially open,
terminals 1 and 12 to close, and a normally closed SPDT switch to terminals 1 and 10 to
stop the door, provides the customer discrete control of each input from a momentary
contact push button station (not included). These commands can also be activated by
presence sensors, or control mats. Reversing the direction of the door while it’s moving
(dynamic) can be accomplished by simply pressing the appropriate switch to change
direction. We do not include any activation devices or push button stations with our
door operators.
The NB-4150 features momentary contact Input commands for External Safety
Devices that comply with Entrapment Protection of UL 325 Section 30.2 (Fail
Safe/Self-Monitoring). These devices are normally door mounted, 4-wire reversing
edge contact type sensors that reverse the door while closing. However, they can be
substituted with non-contact type presence sensors providing the external wiring is
compatible with our internal wiring. Note: The door will not be allowed to close
unless these sensors are correctly wired per this manual. When installing contact
type sensors, assure they are properly secured to the leading edge of the door with sufficient
spacing and length to assure safe activation (refer to the owner’s manual). Momentary
contact Input commands and a low voltage Class (2) power supply are also provided
for additional (redundant) sensors, such as non-contact type presence sensors
that are frame mounted. brookfield industries does not manufacture nor do we include
External Safety Devices with any of our door operators. The installer is solely
responsible for selecting the correct sensors to prevent injury. To assure that external
safety devices are properly installed and adjusted correctly, refer to the owner’s manual
for that devise. For proper wring, refer to Terminal Strip Hookup and the Wiring
Diagram included in this manual.
The NB-4150 also features a maintained contact (constant pressure/dead man)
Input (Terminals 1 & 20) to close the door that complies with UL 325, Entrapment. For
proper wiring to this input, please refer the Terminal Strip Hookup.
The user now has the flexibility of choosing either one of the above methods:
Entrapment by means of maintained contact or External Entrapment Protection through
safety sensors. Both methods can be employed by simply connecting to both inputs.
The maintained contact could then be utilized as an emergency override for closing the
door in case the tape switches fail. This allows the door to stay in operation until the
contact sensors can be repaired.
The Stop command (normally closed terminal #10) will stop the door in any position
when activated but it will not prevent a motor drive from malfunctioning nor is it a true
emergency stop. Emergency Stop (E-Stop) can only be accomplished by
disconnecting AC power to the operator (Terminal L1, L2, L3 and Terminal N).
The NB-4150 features the same Absolute Position Feedback Control system and
software as other brookfield industries, inc. door operators. There are no limit or

proximity switches to adjust or install for any of the door positions under normal
operation. Simply adjust the door’s positioning presets as required by interfacing with
A Rotary Position Transducer attached to the gear motor output shaft provides the
position of the door. As the door changes position, the output signal from the
transducer varies in value. This signal, once converted to a digital value, is stored in the
CPU for further processing. This devise does not need to be “homed” or reset if there is
a power loss or electrical noise nor does it need to go through “learn speed” after power
up or after adjustments have been made.
Motor Control:
The NB-4150 uses a state-of-the-art Adjustable Frequency AC Drive for variable
speed control of the 230-volt, 3 phase, AC motor. The NB-4150 also features a multi-
speed board that attaches to the side of the motor control. The multi-speed board
features control of (4) independent speeds. The NB-4150 now has the flexibility of
controlling separate latch check speeds (Preset 1) and back check speeds (Preset 2)
as well as close speeds (Preset 3) and open speeds (Preset 4). The motor control also
features additional trimpots, which greatly improve the performance of the drive and
motion profile of such heavy doors. The COMP (Slip Compensation) trimpot sets the
amount of Volts/Hz to maintain set motor speed under varying loads. To increase,
rotate clockwise. The ACC (Acceleration) trimpot sets the amount of time for the
motor to accelerate from zero to full speed. To increase acceleration time, rotate
clockwise. The DEC/B (Deceleration) trimpot sets the amount of time to decelerate
from full speed to zero speed. To increase deceleration time, rotate clockwise. The MIN
(Minimum Speed) trimpot sets the minimum motor speed. To increase the minimum
speed, rotate clockwise. The MAX (Maximum Speed) trimpot sets the maximum motor
speed. To increase the maximum speed, rotate clockwise.
The (CL) Current trimpot sets the current limit (overload), which limits the maximum
current to the motor. This trimpot also limits the Maximum Horizontal Operating
Force (lbs) in both the opening and closing directions. To increase, rotate clockwise.
Drive Train:
The NB-4150 is a linear drive system comprised of a 3” wide XH polyurethane steel reinforced
timing belt driven by a 3 phase, 3hp, 1800 RPM, AC motor that is coupled to an in-line helical
(66:1) gear reducer with an output torque rating of 6730 lb-in. The timing belt is open-ended
and attaches to the door in (2) places with specially designed aluminum clamping plates. The
belt is adjusted for pre-tension and tracking from the take-up end frames and pulley assembly.
A properly installed and adjusted timing belt will provide operating forces up to 1800 lbs.
Supply Voltage:
230 VAC, +/- 10%, 60 Hertz, 3 phase 4 wires & GND (L1, L2, L3,.N & GND) are
required to run the 3 phase motor and to provide 110VAC to the 24VDC power supply
and PLC. The 3-phase AC Motor control and 110VAC power supply circuits are
individually equipped with in-line circuit breakers for overload protection.
Surge protection and filtering of the supply voltage is featured to protect door operator
components and to assure reliable performance (immunity) as well as minimizing RF
noise (emissions).
Current Consumption (AC Line Input):
Maximum current/phase 10.8 amps
the PLC via a hand held Human Machine Interface (purchased separately).

Installation Instructions
Although each Door Operator has been fully inspected and tested prior to shipment, assure no
physical damage has occurred during shipment and handling. Premature failure may occur if
any part of the installation is not done properly. The following instructions are specific for side
mounted operators; however, the same instructions and tolerances apply for top mounted
operators as well. Refer to the set of drawings for the mounting style listed below. Use the
corresponding drawing to complete the installation and inspection of each step.
Side Mount Bi-Parting Drawings
Side Mount Single Slide Drawings
Top Mount Single Slide Drawings
1. Install the door attachment bracket (bottom of belt)
- Assure door attachment is level in 2 planes (shim as required).
- Create a centerline on the door attachment. Assure that it is parallel with the
track centerline within (+/-) 1/32” (shim as required).
- Use the centerline on the door attachment as your reference dimension
center line for the motor and take-up end brackets.

2. Install gear motor and take-up end brackets
-Verify the motor and take-up end pulleys are level within (+/-) 1/32”.
-Clamp a string line to the horizontal center and along the bottom of the take-up
and motor pulleys.
-Using the reference center line from the door attachments (from step 1),
assure the motor and take-up pulleys are parallel and the same distance from

the track center line within (+/-) 1/16” (shim as required. Minor adjustments can
be made by loosening the shaft collars, loosening the set screws on take up
bearings, and moving the take up shaft in the desired direction. Remember to re-
tighten all connections).
-Take-up and motor pulleys: measure the vertical distance from the string line to
a straight edge located from a common reference point on the track within
(+/-) 1/16”.
-Properly tighten gear motor and take-up end brackets with hardware
(not included) as specified on drawings.

3. Final Inspection of door attachment bracket
-Verify the vertical distance from the string line to the timing belt mounting
surface is 3/16” (+/-) 1/32”.
-Verify the string line is parallel with the door attachment centerline within (+/-) 1/32.
Shim as required.
-Properly tighten with hardware (not included) as specified on drawings.

4. Mount timing belt
-Adjust take-up end pulley toward the motor end to allow for maximum adjustment
-For Bi-parting doors, assure both doors are in the closed position.
-Attach one side of the 3” timing belt to the bottom of belt door attachment closest to the
motor end. Secure the belt with a clamping plate and mounting hardware provided.
Use an alternating tightening sequence.
-Pull the belt over the idler pulley, then underneath the motor pulley, and over the top,
Take out as much slack as possible (you may need to use c-clamps to hold the belt to
the pulleys).

-Pull the belt to the take-up end. Pass the belt over the top of the pulley and
underneath, taking out as much slack as possible (you may need to use c-clamps to
hold the belt to the pulleys).
-Attach other end of the 3” timing belt to the lower door attachment closest to the take-
up end. Secure the belt with the 2nd clamping plate and mounting hardware provided.
Use an alternating tightening sequence (remove any c-clamps).
-Verify the belt teeth are fully engaged into their respective pulleys. Adjust the take-up
end threaded rods as required.
5. Setting the belt tension (refer to parameter section of the 4150 Manual)
-Belt tension is calculated and listed on the label on the motor bracket and inside the
electrical panel.
-Belt tension should be set with the belt idler engaged (3/8”- 1/2" into the belt).
-For single slide doors: measure the force it takes to deflect the top of the belt 1” at
dead center of the belt between the pulleys. Adjust the tension at the take up end as
required. Adjust each threaded rod evenly to keep the pulley perpendicular to the belt
centerline.

-For bi-parting doors: move the door to the open position then set tension the same as a
single slide door above.
6. Install door attachment for top of belt (Bi-parting Door only)
-Move both doors back to the full closed position.
-Follow the same procedure as described in Step 1
-Assure clamping plate is engaged into the belt teeth and bolted to the take-up end of
door attachment (shim as required).
7. Install Emergency Hand Wheel
8. Caution: To prevent risk of serious injury, assure source voltage has been disconnected and all
“Lock-Out” Safety Procedures have been strictly adhered to.
9. Hookup 230 VAC 3-phase supply voltage and grounding per Terminal Strip Hookup, the
applicable Wiring Diagram and/or local codes.
10. Connect 230VAC 30-phase motor leads to corresponding labeled wires (U, V, W) on the motor.
11. Connect all Class (2) (24) VDC inputs per the Wiring Legend of Terminal Strip Hookup and
the Wiring diagram including required External Safety Devices (not included with operator)
that comply with the External Entrapment Protection of UL 325 for Fail Safe Monitoring.
These devices can be door mounted, 4-wire reversing edge contact type sensors that
reverse the door while closing or compatible non-contact presence sensors. Note: The door
will not be allowed to close unless these sensors are correctly wired per this manual.
When installing contact type sensors, assure they are properly secured to the leading edge of
the door with sufficient spacing and length to assure safe activation (refer to the
installation/owner’s manual).
12. All PLC and motor control settings have been preset prior to shipping; however, these values
may require field adjustments that can vary for each installation (see Parameter for NB-4150).
13. Assure trimpots are set to the 10-20% range before activating the operator.
14. Assure all Safety Instructions and Warnings have been followed.
15. Disconnect the “lock-outs” and turn on power supply breakers
16. Activate Open and Close and Stop Commands.
17. Adjust Open, Partial Open and Close speed “Pots” clockwise to the 65%-70% maximum
setting.
18. Adjust PLC door position factory presets as required. Refer to the Door Position Setup and
and the NB-4000 Parameters sheet if necessary.
19. Adjust Latch Check and Back Check trimpots until a smooth stop has been obtained (20-30%
range).
20. WARNING! To avoid serious injury or death: while the door is closing, activate contact sensors
and assure Latch Check trimpot speed is properly adjusted to prevent injury. Check for pinch
points and adjust the Latch Check Door Position accordingly. Repeat for Back Check while the
door is opening when required.
21. Check timing belt tracking and adjust as required with the take-up end adjusting rods. .
22. Adjust Open and Close trimpots clockwise toward the maximum setting in an incremental
fashion after each cycle.
23. Adjust PLC door position factory presets as required until full travel is obtained. Refer to the
and the NB-4150 parameters sheet if necessary.
24. Be prepared to hit stop button case any obstacles are encountered.
25. Connect ampere meter in series with one of the phases between the Motor Control and the
Motor. Measure and record maximum amperage reading as door accelerates to maximum
Door Position Setup and HMI Instructions
HMI Instructions

speed in both directions. Measure and record maximum amperage while the door is moving at
maximum speed in both directions.
26. Check and adjust, if necessary, the trimpot settings (refer to the Parameter sheet) on the Motor
Control.
27. Check operation of all other safety devices including redundant and non-contact type. Refer to
the installation/owner’s manuals from the sensor manufacturer for proper settings and
adjustments.
28. Operate the door several times assuring all inputs, such as open, close, partial open and stop
features function properly. Make the necessary adjustments as required.

Installation Instructions for Emergency Handwheel
(Refer to drawing NB-4150-EHW-1)
1. If this is a new installation, skip down to step #7.
2. If upgrading to remote disconnect, go to step #3.
3. Mount Emergency Handwheel box to the wall, run cables to the back end of the motor.
4. Unbolt 5/16”-18 bolts from gear reducer, place aside.
5. Place the attachment plate for the remote actuator beneath the upper mounting plate of
the gear reducer.
6. Bolt the remote actuator attachment plate and the gear reducer to the upper mounting
plate using 5/16”-18 x 1 ¾” bolts. DO NOT TIGHTEN.
7. Remove detent screw from square hole bushing on shaft extension of motor.
8. Attach remote actuator cable block to attachment plate with ¼”-20 x 1 3/4” Allen head
cap screws. DO NOT TIGHTEN.
9. Using lever in the emergency handwheel control box, gently pull lever towards you and
turn the handle until the ½” square end of the flex shaft is inserted into the square hole
bushing on the back of the motor; and cable lever locks into place.
10. Tighten the ¼”-20 screws on the remote actuator cable block.
11. Tighten upper mounting plate screws.
12. To release lever, push red button in on the emergency handwheel lever and push
forward towards the back of the box until it locks in place.
13. Test 3 or 4 times by releasing and re-engaging and rotating the motor each time.
***Caution***
Before using door operator, assure that the flex shaft is fully disengaged by pushing lever
arm forward until it is locked in place and closing the door on NEMA 1 box.

NB-4150
-01 Touch Screen
1. before ‘G,’ use the black cable, plug the opposite round end into the PLC
unit on the operator. For ‘G’ series and above, use the gray cable and
plug the opposite round end into the receptacle on the end cover of the
operator (right side).
2. A “Please Wait” message will flash for a few seconds and then a selection
screen will show.
3. Choose either Master / Slave or Standard operator. For Master / Slave,
select Lead or Follow Door on the next screen, then skip to step 6.
4. For Standard operator, choose the appropriate ship date of the operator
on the next screen.
5. You’ll be given a display of the first three user presets. To edit a preset,
simply touch the preset number value.
6. You’ll then be given a keypad display for entering the new preset. Enter
the desired value and touch the enter (back arrow) key to set the value.
Press ESC to cancel and go back to the preset list.
7. Press Next to display the remaining user presets.
*Note: Real Time Door Position (RTDP) is always displayed on both preset
screens
Plug the eight prong Phoenix Connector into HMI. For operator series
HMI GT
Door Position Setup and HMI Instructions

GT-01 Touch Screen
2. A “Please Wait” logo message will flash for a few seconds and then a selection
screen will show.
1. Plug the eight prong Phoenix Connector into GT-01. For operator series before
ʻG,ʼuse the black cable, plug the opposite ROUND end into the PLC unit on the
operator. For ʻGʼseries and above, use the gray cable and plug the opposite
ROUND end into the receptacle on the end cover of the operator (right side).
3. For GT-01 software prior to Ver. 3, the screen in Fig. 3 will display. Choose either
ʻStandardʼor ʻMain/Subʼoperator. For Ver. 3 of the GT-01 software, the screen in
Fig. 4 will display. For Main/Sub, select ʻLead Door ʻor
ʻFollow Doorʼon the next screen (Fig. 5), then skip to step 5.
Fig. 2
Fig. 3 Fig. 4
Fig. 5
4. Selecting Standard will give you the screen shown in Fig. 6. Choose the appropriate
serial number series of the operator, to get to the first preset screen (Fig. 7)
Fig. 6 Fig. 7
Door Position Setup and HMI Instructions

5. Youʼll be given a display of the first three user presets (Fig. 7). To edit a preset,
simply touch the preset number.
6. A keypad will then display for entering the new preset (Fig. 8). Enter the desired
value and touch the ENTER (bent arrow) key to set the value. Press ESC to
cancel and go back to the preset list.
7. Press ʻNextʼ(Fig. 7) to display the remaining user presets or ʻBackʼto return
to the previous screen.
Note: Real Time Door Position (RTDP) is always displayed on both preset screens
Fig. 8
I/O Diagnostics for Series ʻiʼOperators and Above only
Selecting the ʻI/O Diagʼbutton from main screen (Fig. 4), will bring you to the
screen in Fig. 9. ʻOutputsʼwith display the screen in Fig. 11.
Fig. 9
Select ʻInputsʼto display the Input
Diagnostic Screen (Fig. 10).
Fig. 10
The buttons down the left
side, represent an actual
input to the PLC. All
standard Operator functions
can be tested using these
buttons.
The lamps down the
right side of the
screen indicate
when an actual
ʻhardʼinput is being
read by the PLC.
E.g., if a Wall Switch or
other device is sending an
input, the applicable lamp
will be lit.
The lamps down the right side
of the screen indicate when
the PLC is sending the
corresponding Output to the
motor control.
The serial number series referred to in these instructions is the starting letter of the Operators Serial Number.
NOTE: When using the newer GT-01 Software with an older PLC, or vice-versa, the initial startup of the GT-01 may be longer than usual and/or may
display an error on the screen, it will then clear and go to the initial screen shown in either Fig. 3 or Fig. 4