Distribution of the Arm Strength (top) and Arm Curvature attributes (bottom) for the 3881 and 2127 EFIGI galaxies for which these attributes are defined (same presentation as in Fig. 5). The top panel shows the tight relation between the relative flux in the spiral arms and the morphological type, with an increase of the Arm Strength from types Sa to Sc, then a decrease from types Sd to Im. The bottom panel shows a decrease of the Arm Curvature for increasing spiral types.