Left and centre: exposure-corrected 0.5–4 keV images observed about six hours apart. Right: difference images highlighting the short-timescale evolution over six hours. the blue-red pattern shows rings undergoing outward motion and subtle fading. The top row shows data from the first epoch, around 2.3 days, from the EPIC MOS1 and MOS2 cameras, and the bottom row shows the second-epoch data from around 4.7 days from EPIC MOS1, MOS2, and pn.