RMS magnitude deviation versus mean magnitude for the 2523 and 3010 calibrated R light curves, extracted by DaoPhotII (upper panel) and the modified version of DanDIA (lower panel), respectively, for the central region of the ω Cen cluster. The photon noise and excess noise limits are shown as a blue dotted, and a red solid line, respectively. The dashed green line shows the noise limit for a 18.5 mag/□″ background signal.
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