Estimation of the noise model for the HR 8799 (a) and RY lup (b) datasets. The model is fitted on the median fluxes and the median variances of the different calibration files: the dark currents with the shutter close (red) and open (green) and the flat-fields (blue). The error bars are obtained by the median absolute deviation on all the sensor pixels for each acquisition set. The grey law is fitted without taking into account the errors. The black law is fitted by accounting for the errors. The red and blue insets are zooms on regions of low incident fluxes.