dimension reduction trouble

Hello.

I am getting an error because I am trying to read a 4d variable into a
pre-assigned 3D array.

do ifil = 0, (numFILES-1)/4 ; BIG FILES LOOP ; NEW file loop
      b = addfile(FILES(ifil*4+2)+".nc","r")
      FNLv925(ifil,:,:) = b->VV(0,4,:,:)

 In following the NCL basic tutorial, I see that reading-in a 4D
variable in such a way "should" reduce its dimensions, right?

What function will "squeeze" the 4D variable? Also, where is this
covered in the introduction to NCL, so that I can review it?

Sincerely,
Erik

Here is my error:

Erik_at_noble:/Volumes/Data_and_Models/ncl_scripts:ncl test_script2.ncl
 Copyright (C) 1995-2007 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.

export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
export: Command not found.
Bad : modifier in $ ($).
fatal:Dimension size mismatch on subscript #1, left-hand and
right-hand side dimensions do not match
fatal:Execute: Error occurred at or near line 66 in file test_script2.ncl

Erik_at_noble:/Volumes/Data_and_Models/ncl_scripts:

My Code is attached.

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