structure of geo_borders.cdf

[Martin Schmidt <mschmidt@xxxxxxxxxxxxxxxxx>]

Hi all,

I am trying to generate regional high resolution land masks, 
which do basically the same as 'go land'. The main task is to 
generate a file with the same structure like geo_borders.cdf. I 
get problems, when the Greenwich meridian is crossed. If 
longitudes west of the Greenwich meridian are counted as 
negative in both, the displayed variables and the coordinats of 
land contours in my regional version of geo_borders.cdf 
everything works fine. Also if longitudes are counted from, say 
350 to 370 degrees, I get correct plots. However, drawing a 
variable with negative western longitudes, land contors defined 
from 350 to 370 degrees are not shown. The original "go land" 
works!
  
Is anyone able to explaine the following

use coads_climatology
shade/l=1/x=-5:15/y=54:60 sst
go land

works. 

shade/l=1/x=0:20 sst
go land