Frame registration for R CrA for six of the parameters used in the frame selection, and examples of frames with different centering. Top left: Distribution of the star position with respect to the AGPM center along both axes. Top right: Torus_S/N as a function of the star position with respect to the AGPM center along the X-axis. Bottom left: Homogeneity H as a function of the star position with respect to the AGPM center along the X-axis Bottom right: Examples of images with good (red triangles), intermediate (green squares), and poor (cyan circles) centering. The yellow stars correspond to the star position, while the red crossed circles give the AGPM position. The images have the same color scale.