Relation between V_rot and the diskextension in the line for the star sample (black dots) included in this work and Meilland et al. (2012). The colored linessymbols are given in the top left of the figure. The blue dashed line from Fig. 15 could state an upper limit for the disk size of the stars indicated as “without variability”. The orange dotted line seems to oultine a second linear regretion from stars with stable disks.