Two-dimensional correction map (CCD-temperature and Y position of the PSF) for the about-30-day-long UBr time series of ε Sco obtained during observing subset 2 with the colour-coded correction factors. Right and bottom panels: correction factor as a function of the Y position of the PSF and CCD temperature, respectively, where the values of the other parameter are colour-coded (with red-green-blue symbols corresponding to low-mean-high values of the other parameter). The black dots are the actual measurements divided by the average value of the time series.