Corrected blue fraction as a function of the group-centric distance in the low-z poor groups (left) and rich groups (right). We define poor(rich) groups as those with number of member galaxies  ≤ ( > )12 after applying the evolving magnitude cut off (see Fig. 3). The mass bins adopted are indicated in the legend. Corrected blue fractions are displayed at the median of the distances from the center for galaxies in each region. As a reference we also plot the fraction of the blue field galaxies and the mean corrected blue fraction in groups.