Is the white dwarf in HS2331+3905 a rapid rotatorquestionMark

We have recently identified the cataclysmic variable (CV) HS2331+3905, whichdisplays a fascinating combination of properties: it is probably one of theoldest known CVs with a brown dwarf donor, it is brightest CV containing apulsating white dwarf which is probably rotating with a very short spin periodof 67s, and it may harbour a precessing warped accretion disc. We have alreadyexplored this system from the ultraviolet into the infrared, and request hereXMMNewton time to unambiguously determine whether the white dwarf inHS2331+3905 is a magnetic rapid rotator. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]