The vignetting function is available for the ROSAT X-ray telescope in tabulated format. The exact values of the vignetting depend on the detector. The EXSAS calibration area contains the tables vignet_pspc.tbl and vignet_hri.tbl, where the vignetting is tabulated for different off-axis angles and amplitudes. The vignetting can also be deduced from the instrument maps. Instrument maps for different amplitude intervals are available in the EXSAS calibration area for the ROSAT PSPC.