Left: spatial distribution of all stars observed by SEGUE (dots) and those with available photometry (light grey) for each cluster. Dashed lines denote the radii used to select cluster members, which are marked as black circles. Right: radial velocity histograms of all stars observed by SEGUE (grey) and those located within the radii used to select cluster members (black). Dashed lines denote the radial velocity limits used (see Table 1). [Fe/H] distributions of stars selected for their radial velocity and [Fe/H] have been plotted in the inset panels with grey and black lines, respectively.