Data sets and their associated histogram in two cases: on top, the very simple case of a Poisson realization of the image of a square with uniform value 10; on the bottom, a toy model Cas A image obtained by taking a Poisson realization of a high-statistics denoised image of Cas A (hereafter called toy model). On the right, the black histogram correspond to the original data . The red histograms are those of the data sets obtained through resampling of the original data and the blue ones are the histograms of a Poisson realization of the original data. It appears that the resampled data sets have histograms highly similar to that of the original data with additional Poisson noise.