Top panel: the sky distribution of LTGs within seven annuli of increasing radius from M 87. Galaxies in each ring are given with a different color. b) SSFR; c) SFR per unit HI mass; d) HI-deficiency as function of the projected angular separation from M 87. Bottom panel: same as above in bins of local galaxy density. This analysis is limited to galaxies with projected distance <45° from M 87, i.e., 20 objects in the interval 15:00:00 < RA < 16:00:00) were excluded because they do not constitute a statistically meaningful subset.