RX J0720 evolution: precession comma glitching comma the last flutterings of a magnetarquestionMark

RX J0720.43125 belongs to a group of radioquiet isolated neutron stars, whosespectra are characterized by a blackbody spectrum plus one or more broadabsorption features. It is unique in that its blackbody temperature, and thedepth of the absorption feature is variable. The cause for this spectralevolution is unclear, but one proposed model is free precession of a neutronstar with two hot spots. Observing in the next XMMNewton cycle will completethe coverage of a putative precession cycle with a period of 7.1+/0.5 yr. Thisputs the precession hypothesis to the ultimate test. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]