sub-REGIONS of three-arguments (curvilinear) SHADE,FILL,CONTOUR andVECTOR

[<emanuele.lombardi@xxxxxxxxxxxxxxxx>]

Dear Ferreters,
here I am asking again for your help.

My data is defined on axis which are 2 dimensional. I shade the data
using
	yes? set REGION/K=1/L=1
	yes? SHADE temp, lon, lat

where lon and lat are 2 dimensional arrays.
lon    contains nx*ny longitudes 
lat    contains nx*ny latitudes 
temp   contains nx*ny temperatures at each level/time

Now I would like to shade subregions of the area using X and Y values I
get from a java applet. For istance, If I want to shade only the area
which longitudes lies between 10 and 20 degrees_east, I do the following

	yes? set region/X=10:20/Y=.......

BUT the X axis doesn't exists for any variable AND I don't know how to
create it since it should be made up of a bidimensional array of values.

I'm aware I could define the region using I & J instead of X & Y, but I
prefere to use directely X and Y values coming from he applet without
any conversion.

I see this is a much difficult question than the yesteday's one, 
so I thank you in advance for any help!

Emanuele




PS. here the ncdump -h of my file


netcdf tipo1a {
dimensions:
        time = UNLIMITED ; // (13 currently)
        nz = 40 ;
        ny = 98 ;
        nx = 162 ;
variables:
        double time(time) ;
                time:var_code = 1000 ;
                time:long_name = "time" ;
                time:short_name = "time" ;
                time:units = "hours since 1962-05-10 00:00:00" ;
                time:coordinates = "time" ;
                time:axis = "T" ;
        float sigma(nz) ;
                sigma:var_code = 5009 ;
                sigma:long_name = "vertical sigma level" ;
                sigma:short_name = "sigma level" ;
                sigma:units = "adim" ;
                sigma:coordinates = "nz" ;
                sigma:axis = "Z" ;
       float lat(ny, nx) ;
                lat:var_code = 5000 ;
                lat:long_name = "latitudine" ;
                lat:short_name = "lat" ;
                lat:units = "degree_north" ;
                lat:coordinates = "nx ny" ;
                lat:axis = "Y" ;
        float lon(ny, nx) ;
                lon:var_code = 5001 ;
                lon:long_name = "longitude" ;
                lon:short_name = "lon" ;
                lon:units = "degree_east" ;
                lon:coordinates = "nx ny" ;
                lon:axis = "X" ;
        float temp(time, nz, ny, nx) ;
                temp:var_code = 10004 ;
                temp:long_name = "temperature" ;
                temp:short_name = "t" ;
                temp:units = "K" ;
                temp:coordinates = "time sigma lon lat" ;
}


-- 

$$$ Emanuele Lombardi
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