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longitude problem


I use LAS 6.0

I have included a COARDS netcdf dataset through the perl script :

../xml/perl/addXml.pl las.xml las.xml <my netcdf file>
../xml/perl/genLas.pl las.xml 

My netcdf file is covering longitudes from -40 to 0 degrees east with a
measurement every 2 degrees.
In my las.xml file I have a longitude axis :
<EPPE_WAM_Atl_200203200300_nc_lon units="degrees_east" type="x">
  <arange start="-40" step="2" size="21"/>

On the LAS User Interface my plotted grid appears with :
	las_longitude = -40 + (real_longitude -22) mod 40

Thus, if I plot the full region, the frame is well located but the
top-left corner of my grid is located at longitude -22E instead of -40E.
The top-right corner is located at longitude -22E instead of 0 and every
points in my grid are translated as well.

The same thing happens if my longitude axis is (changing "start"
attribute to "320" and re-launching "../xml/perl/genLas.pl las.xml"):
<EPPE_WAM_Atl_200203200300_nc_lon units="degrees_east" type="x">
  <arange start="320" step="2" size="21"/>

Do someone have an idea of what happens to my netcdf file.



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