7–28 Å energy band MOS1 image in the detector coordinate system for M 87. The MOS1 DETX axis is in parallel with the cross-dispersion direction (XDSP) of the RGS. In the second observation (0200920101), the non-thermal emission is much brighter, offset by ∼1.5 arcmin, and the image is rotated ∼188^° clockwise. The (blue) rectangular boxes indicate the extraction regions for rgsvprof. For the first observation, a 99%-xpsf (∼3.4 arcmin) extraction region, aligned with the RGS source extraction region, is used. For the seconding observation, only the onset 95%-xpsf (∼1.6 arcmin) extraction region (to avoid central contamination) is shown for clarity.