reversed map

[Laurie C G Menviel <menviel@xxxxxxxxxx>]

HI, 
 
My data set looks like this: 
      		I         J         K         L 
 MEDIUMC2D   1:720     1:359     ...       ... 
 
It s a text file, a matrix with the first row representing lat=89N and 
going down to row 359 lat=89S 
When I want to shade this variable I get a reversed map (I got 
Greenland data in Antarctica). It looks like only the y axis is 
reversed> 
 
I typed: 
set data/format=delimited[/delim="\t"] c1.dat 
yes? define axis/x=-180:180:0.5/unit=degrees xlong 
yes? define axis/y=90:-90:0.5/unit=degrees ylat 
yes? define grid/x=xlong/y=ylat c12d 
yes? file/variables=mediumc2d/columns=720/grid=c12d c1.dat 
yes? shade/levels=(0,20,5) mediumc2d 
 
I also tried  
yes? define axis/y=-90:90:0.5/unit=degrees ylat 
but it s the same 
 
Thanks for your help 
 
Ps. I also noticed that I get the same problem if I import ferret 
netcdf data to matlab  
 
laurie