Noise statistics of the NaCo-ISPY data. Top: Residuals for HD31648 and HD36112 (left and right respectively). The ring highlights the location where the noise is investigated in this figure, at 3λ/D. Bottom: Q-Q plots comparing the noise in the data (blue datapoints) with the expectation from Gaussian noise (gray line). In the right panel the light tails due to the presence of the disk signal and consequent negative self-subtraction cause the noise to deviate from a normal distribution.