Fig. 1
Upper panel: background-substracted LETGS ± 1 order light curve of Ark 564 binned at 200 s. The light curve shows 0.3−1 keV flux variation. The shortest (detectable) timescale is ~1.2 ks. The min/max amplitude change ΔC (Cmin at ~38 ks to Cmax at ~70 ks from the start of the observation), is ~60%. See text for more details. Middle panel: the light curve shows the hard band 2−10 keV flux variation. Bottom panel: the hardness ratio hard/soft band shows no important variation.
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