Examples of the distribution and registration of frames as a function of different parameters. Left: S/N of the torus as a function of the difference between the positions of the star and of the AGPM along the X-axis. Right: relative position of the star with respect to the position of the AGPM. For both panels the star is HD 34282 and the color-coding corresponds to the goodness of fit. The crosses in both panels correspond to the typical uncertainties. The contours contain 93 and 68% of the data in the left panel, and 93, 68, and 50% of the data in the right panel.