writing lat in the file

hi

I have a problem with writing lat to the file. I don't know why

Here's an error message:

pacman3 2277% ncl brunt-vaisala.ncl
 Copyright (C) 1995-2011 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.0.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.

Variable: n
Type: float
Total Size: 26017992 bytes
            6504498 values
Number of Dimensions: 4
Coordinates:
Number Of Attributes: 3
  units : s-1
  long_name : brunt-vaisala frequency
  _FillValue : -99999
(0) Writing to file...
fatal:Variable (lat) is undefined
fatal:Execute: Error occurred at or near line 202 in file brunt-vaisala.ncl

-- 
regards
*******************************************************
*Alexander Semenov*
*
*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks
930 Koyukuk dr, 408c3
Fairbanks, AK, USA, 99775
work phone +19074742672

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