S_Q values for all stars in the V images as a function of an arbitrary star number. The blue line is the threshold below which RR Lyrae stars tend to be found. The known variables V1, V2, and V4 are labelled as well as the newly identified long-period variable V5, the new SX Phe V6 and V7, and one candidate SX Phe star (red points). The cyan points correspond to the stars identified by Cote et al. (1991) as blue stragglers.