SFRs as a function of the H broad-band magnitude. The symbols are as follows: red solid circles – spectroscopically confirmed member galaxies; magenta circles – excess line emitters; red boxes – galaxies on the red sequence; grey crosses – all other detections; orange triangles – galaxies within 200 kpc of the BCG. The arrows represent galaxies with fainter narrow-band magnitudes than expected from their broad-band magnitude, a possible evidence for Hα in absorption. The red dash–dotted line represents a least-squares fit to the data points of confirmed members. The 5σ SFR detection limit is shown as the dashed horizontal line, as described in Section 2.2.