by @chbwl08. As in @chbwl08, we calculated particle background scaling factors by comparing the 10–12 keV (MOS) and 12–14 keV (PN) count rates for the source and closed-filter datasets[^3]. The exposure times for the data sets were 107 ks for MOS1, 83 ks for MOS2 and 196 ks for PN. We used a circular region with a radius of 12,000 pixels in the energy ranges stated above. After this we extracted spectra for the source files and the background files and measured the count rate. Our scaling factors (ratio between the count rate of the source files and the count rate for the closed filter files) for the MOS1, MOS2 and PN cameras are 1.54, 1.70 and 1.63 respectively.\
We chose a background region which was near the source, but did not contain any emission from it (this region lies between 320 and 480 arcseconds from the source as shown in Section \[spectralregion\]) The spectra for the X-ray background for the three cameras, determined from this background region, were then modelled in [xspec]{}, ignoring the energy range between 1.4 and 1.6 keV where an instrumental line affects the fit. The X-ray background is modelled as a double [*apec*]{} + absorbed 