@INITSCREEN           (screen type on pc, screen dimension on unix)
2    930 670          JVGA  NXPIX  NYPIX (1024x768)
2   1200  900         JVGA  NXPIX  NYPIX (21" scherm)
jvga = 1, vga: jvga  = 2, supervga:  (only on pc)
NXPIX, NYPIX, hor. and ver. resolution of initial screen (only on unix)

@GRAFCOL                          colors in graphic screens
 6  38  24  16  30                NCOLDG,NCOLRG,NCOLSP,NCOLLN,NCOLTX
                                  grid,  temp   perm   landb  vectors
12 = geel        
16 = groen       
20 = licht blauw 
24 = donker blauw
38 = bijna wit    

@TEXTCOL                           colors in text screens
0  5     standard background           R   0 : Black       4 : Cyan
0  4     choice menu's                 R   1 : Red         5 : Blue
0  4     input forms                   R   2 : Yellow      6 : Magenta
1  7     error messages                R   3 : Green       7 : White
7  5     titles in help                R
0  4
1  7     program name on top of screen R
7  5     help pages                    R
7  5     key explanation bottom line   R
1  4
0  4     popup screen help             R
7  0     shadow behind input forms     R

@NPOS    size + position of HELP text screen
2  2  78  16

@CIRCLE             (size of circle relative to screen dimensions)
.005                RCIR

@SUNSET             (deviation from standard position of sun, in degrees)
10.0    45.0        THSUN  PHSUN
THSUN =< -45 : night, THSUN = 45: tropical 12 hrs
PHSUN = 0: sun west,  PHSUN = 180: sun east

@ISOVALUES          ()
0   -3.0       3.0   30  6   auto, VMIN, VMAX, NV

@LEGPOS
2 7 2 85                     xleg, yleg, xinfo, yinfo