Light curves of the four XMM-Newton observations (pn in green, MOS1 in black, MOS2 in red). For each exposure, the top (resp. bottom) panels show the light curves with 200 s (resp. 1000 s), whilst the left, central, and right panels display the total, soft, and hard light curves, respectively. The ordinates are in count/s: on the left side for the total light curves, on the right side for the soft and hard light curves.