Variance in the mPCA cleaned cubes varying the number of components removed. With dotted lines and filled symbols, we refer to cleaning by fixing the number of the large-scale components removed, N_L, given by the colour of the line (inset colour scale), and with solid lines and empty symbols, the other way around: N_S is kept fixed (colour) and N_L is varying (x-axis). With empty magenta symbols we highlight the cubes cleaned with N_L = N_S, for a more direct comparison with the PCA results, shown by the red squares and solid line. We show the estimated uncorrelated noise level with a grey band.