Upper panel: the modulation index (black dots) and the average flux density measurement errors (cyan dots) of AO 0235+164 plotted versus time. The errors are given in percentage with respect to the average flux density of the source during the about three years of observation. The green squares and red triangles show the modulation index of the slow and fast variability component, respectively. Lower panel: the correlation function between the modulation index and the flux density measurement errors.
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