Fig. 5

CMD of all investigated objects. Filled circles: spectroscopically confirmed Virgo cluster members, filled circles with surrounding open circle: irregular Virgo galaxies (confirmed), open triangles: spectroscopically confirmed background objects, filled triangles: remaining objects with VCC index, open circles: remaining objects with Sérsic index n > 1.5, asterisks: assumed Virgo cluster members, crosses: excluded from Virgo cluster sample by position in CMD. Thin black line: fit to confirmed cluster members; dashed lines: 5σ confidence interval; thick line: redshift evolution of an E-type galaxy modelled by GALEV (dark grey intercept: Virgo redshift, red: redshifted up to z = 0.65).
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