(To be seen in landscape) Measured flux of the 12 brightest sources at two different epochs for the 15 possible combinations. Flux units are μJy. The solid line is the equal flux line. Open triangles are the originally measured fluxes and the number at the top-left corner of each panel is the median of the ratios between the two epochs. Filled dots are the fluxes after the epoch-dependent correction listed in Table 5 are applied, and the number at the bottom-right corner of each panel is the median of the ratios between the two epochs.