Derive a single polarization UV table with the polarization state specified by Key from a multi-polarization UV table. The command work on the UV_DATA buffer unless the /FILE option is present.
Key is any of the following
NONE, I, Q, U, V, RR, LL, HH, VV, XX, YY.
A typical use is after command FITS on CASA data
FITS Fits.uvfits TO UVin.uvt STOKES NONE /File UVin Uvout