Curves in three energy bands and their ratios. Left and middle: EPIC light curves in the two XMM-Newton observations (March in the left panel, October in the middle panel) in the 0.5–1.5, 1.5–4., and 4–10 keV energy bands with a 1 ks time bin. EPIC-MOS1 data are shown with a solid black line and dots, MOS2 with a dashed red line and crosses, and pn with a dotted green line and triangles. Right: ratios of these count rates for the first (top) and second (bottom) XMM-Newton observations.