rotated lat/lon grid

[Hágel Edit]

Hi!

I've started to use Grads just recently and I try to plot some grib
files. These files contain data on rotated lat/lon grid with the
following parameters:

Data represent type:                                rotated lat/lon
Number of points along a parallel.                 306
Number of points along a meridian.                 260
Latitude of first grid point.                   -20.427
Longitude of first grid point.                  -46.475
Resolution and components flag.               10000000
Latitude of last grid point.                     31.373
Longitude of last grid point.                    14.524
i direction (East-West) increment.                 0.200
j direction (North-South) increment.               0.200
Latitude of southern pole of rotation.          -40.000
Longitude of southern pole of rotation.          22.000
Angle of rotation.                              .0000000000

Could anyone help me how to plot these fields correctly, i.e. how to
tell grads about the rotation? I generated the ctl file with
grib2ctl.pl, and I get this as part of the ctl file:

* Rotated LatLon grid: South pole lat -40.000000 lon 22.000000  rot
angle 0.000000
ydef 260 linear -20.427000 0.2
xdef 306 linear -46.475000 0.199996721311475



Thanks in advance,
Edit Hagel