Running mean of the reference-to-measured flux ratio of 500 artificial stars added to an example raw RTF image before sky-ring subtraction using the ringsub procedure, the tringSub task, and the azimuthally averaged spectrum approach. Consistently with data given in Table 2, the first and last show a similar flux recovery behaviour, whilst the tringSub approach leads to a mean flux overestimation about 6%. The shaded region represents the error of measured fluxes corresponding to the ringsub routine. The error distributions of the other two procedures resemble this one. See text for details.
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