Statistical moments evolution based on a rolling annulus which paves the full annular-PCA processed frame. The top and bottom rows refer, respectively, to the sph2 and nrc3 ADI sequences. Colour curves on each subplot refer to a different principal component ranging from one to thirty. The bold curve on top of each subplot indicates the average of the thirty PCs, and PC=1 and PC=20 are illustrated with specific symbols. In the case of sph2, grey areas highlight the inner working angle (IWA).