Cumulative distribution diagrams of stars that present a single mode of irregular variability, as a function of their V − I color (left panel) and their I-band magnitude (right panel). Bumper stars are shown with a dash-dotted red line, flicker types with a dashed blue line, monotonic types with a solid black line, and fading types with a solid cyan line. We note that all four modes exhibit colors between −0.2 and 0.3 mag. The colors of bumper stars are shifted towards the blue only because of their insufficient V-band monitoring. Flicker-type stars appear to be the brightest among the modes. About half of the single-mode irregular variables are spectroscopically confirmed as Be stars.