ferret -gui gives errors with some longitudes (while non-gui ferretdoes'nt)

[<emanuele.lombardi@xxxxxxxxxxxxxxxx>]

Dear Ferreters,

I'm having troubles using Ferret -gui with some netcdf files.
I have same netcdf file which can be happily plotted using the non-GUI ferret,
while they result in error while plotted or accessed by the ferret -gui

Ferret version is 5.22 and it runs on COMPAQ tru64 v5.1A O.S.

I have a topography netcdf file which longitudes go from -13 to 36 degrees_east.
Ferret -gui returns the following error whenever I ask for
"View-->Variable Values"  or I try to plot the data,
	
	**ERROR: illegal limits: "TOPOT[D=TOPOT.NC]"    \
	is not in the range X=13W:36E(396)           	\
	Axis extremes are X=13.1W(-13.1):36.1E 

The strange is that non-gui Ferret properly works with this file.

If I produce another netcdf file with the same data but the longitudes, (adding 360 
to them so that they range from 347 to 396 degrees_east) then both 
Ferret -gui and non-gui Ferret work properly.

So I'm here asking for your help to understand where I do make mistakes.
After my signature I write some details to better show the problem.

Thank you very much from Italy,
Emanuele Lombardi

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--------- DETAILS -----------------------

The "guilty" netcdf file is named topot.nc and it has the following ncdump 

netcdf topot {
dimensions:
        nxt = 197 ;
        nyt = 57 ;
variables:
        float nxt(nxt) ;
                nxt:var_code = 5001 ;
                nxt:long_name = "longitude" ;
                nxt:short_name = "lon" ;
                nxt:units = "degrees_east" ;
                nxt:coordinates = "nxt" ;
                nxt:axis = "X" ;
        float nyt(nyt) ;
                nyt:var_code = 5000 ;
                nyt:long_name = "latitude" ;
                nyt:short_name = "lat" ;
                nyt:units = "degrees_north" ;
                nyt:coordinates = "nyt" ;
                nyt:axis = "Y" ;
        float TOPOT(nyt, nxt) ;
                TOPOT:var_code = 6000 ;
                TOPOT:long_name = "topography" ;
                TOPOT:short_name = "topo" ;
                TOPOT:units = "m" ;
                TOPOT:coordinates = "nxt nyt" ;
                TOPOT:_FillValue = 9.96921e+36f ;

// global attributes:
                :institution = "ENEA-CLIMA" ;
                :filetype = "type7" ;
                :model_code = 2 ;
                :run_date = "2001-12-06 17:26:06" ;
                :user_name = "lele" ;
data:

 nxt = -13, -12.75, -12.5, -12.25, -12, -11.75, -11.5, -11.25, -11, -10.75, 
    -10.5, -10.25, -10, -9.75, -9.5, -9.25, -9, -8.75, -8.5, -8.25, -8, 
    -7.75, -7.5, -7.25, -7, -6.75, -6.5, -6.25, -6, -5.75, -5.5, -5.25, -5, 
    -4.75, -4.5, -4.25, -4, -3.75, -3.5, -3.25, -3, -2.75, -2.5, -2.25, -2, 
    -1.75, -1.5, -1.25, -1, -0.75, -0.5, -0.25, 0, 0.25, 0.5, 0.75, 1, 1.25, 
    1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, 5, 
    5.25, 5.5, 5.75, 6, 6.25, 6.5, 6.75, 7, 7.25, 7.5, 7.75, 8, 8.25, 8.5, 
    8.75, 9, 9.25, 9.5, 9.75, 10, 10.25, 10.5, 10.75, 11, 11.25, 11.5, 11.75, 
    12, 12.25, 12.5, 12.75, 13, 13.25, 13.5, 13.75, 14, 14.25, 14.5, 14.75, 
    15, 15.25, 15.5, 15.75, 16, 16.25, 16.5, 16.75, 17, 17.25, 17.5, 17.75, 
    18, 18.25, 18.5, 18.75, 19, 19.25, 19.5, 19.75, 20, 20.25, 20.5, 20.75, 
    21, 21.25, 21.5, 21.75, 22, 22.25, 22.5, 22.75, 23, 23.25, 23.5, 23.75, 
    24, 24.25, 24.5, 24.75, 25, 25.25, 25.5, 25.75, 26, 26.25, 26.5, 26.75, 
    27, 27.25, 27.5, 27.75, 28, 28.25, 28.5, 28.75, 29, 29.25, 29.5, 29.75, 
    30, 30.25, 30.5, 30.75, 31, 31.25, 31.5, 31.75, 32, 32.25, 32.5, 32.75, 
    33, 33.25, 33.5, 33.75, 34, 34.25, 34.5, 34.75, 35, 35.25, 35.5, 35.75, 36 ;
}


The "OK" file is named topot_ORIG.nc and it differs from the "guilty" one
only for the longitudes values.

netcdf topot_ORIG {
dimensions:
        nxt = 197 ;
        nyt = 57 ;
variables:
        float nxt(nxt) ;
                nxt:var_code = 5001 ;
                nxt:long_name = "longitude" ;
                nxt:short_name = "lon" ;
                nxt:units = "degrees_east" ;
                nxt:coordinates = "nxt" ;
                nxt:axis = "X" ;
        float nyt(nyt) ;
                nyt:var_code = 5000 ;
                nyt:long_name = "latitude" ;
                nyt:short_name = "lat" ;
                nyt:units = "degrees_north" ;
                nyt:coordinates = "nyt" ;
                nyt:axis = "Y" ;
        float TOPOT(nyt, nxt) ;
                TOPOT:var_code = 6000 ;
                TOPOT:long_name = "topography" ;
                TOPOT:short_name = "topo" ;
                TOPOT:units = "m" ;
                TOPOT:coordinates = "nxt nyt" ;
                TOPOT:_FillValue = 9.96921e+36f ;

// global attributes:
                :institution = "ENEA-CLIMA" ;
                :filetype = "type7" ;
                :run_date = "2001-11-29 11:07:06" ;
                :user_name = "Rupolo" ;
                :model_code = 1 ;
data:

 nxt = 347, 347.25, 347.5, 347.75, 348, 348.25, 348.5, 348.75, 349, 349.25, 
    349.5, 349.75, 350, 350.25, 350.5, 350.75, 351, 351.25, 351.5, 351.75, 
    352, 352.25, 352.5, 352.75, 353, 353.25, 353.5, 353.75, 354, 354.25, 
    354.5, 354.75, 355, 355.25, 355.5, 355.75, 356, 356.25, 356.5, 356.75, 
    357, 357.25, 357.5, 357.75, 358, 358.25, 358.5, 358.75, 359, 359.25, 
    359.5, 359.75, 360, 360.25, 360.5, 360.75, 361, 361.25, 361.5, 361.75, 
    362, 362.25, 362.5, 362.75, 363, 363.25, 363.5, 363.75, 364, 364.25, 
    364.5, 364.75, 365, 365.25, 365.5, 365.75, 366, 366.25, 366.5, 366.75, 
    367, 367.25, 367.5, 367.75, 368, 368.25, 368.5, 368.75, 369, 369.25, 
    369.5, 369.75, 370, 370.25, 370.5, 370.75, 371, 371.25, 371.5, 371.75, 
    372, 372.25, 372.5, 372.75, 373, 373.25, 373.5, 373.75, 374, 374.25, 
    374.5, 374.75, 375, 375.25, 375.5, 375.75, 376, 376.25, 376.5, 376.75, 
    377, 377.25, 377.5, 377.75, 378, 378.25, 378.5, 378.75, 379, 379.25, 
    379.5, 379.75, 380, 380.25, 380.5, 380.75, 381, 381.25, 381.5, 381.75, 
    382, 382.25, 382.5, 382.75, 383, 383.25, 383.5, 383.75, 384, 384.25, 
    384.5, 384.75, 385, 385.25, 385.5, 385.75, 386, 386.25, 386.5, 386.75, 
    387, 387.25, 387.5, 387.75, 388, 388.25, 388.5, 388.75, 389, 389.25, 
    389.5, 389.75, 390, 390.25, 390.5, 390.75, 391, 391.25, 391.5, 391.75, 
    392, 392.25, 392.5, 392.75, 393, 393.25, 393.5, 393.75, 394, 394.25, 
    394.5, 394.75, 395, 395.25, 395.5, 395.75, 396 ;
}

Nothing bad happens and ferret -gui succesfully plots it.
The same it happens to non-gui Ferret wich properly reads and plot the file
(as supposed, of course!) 

I don't attach the netcdf files to this mail, but if you want to have a
look, please get them from anonymous ftp:/canova.casaccia.enea.it

the "guilty" file is named topot.nc 		(46864 bytes)
the "OK"     file is named topot_ORIG.nc	(46960 bytes)