Bailey diagrams for all the RRL stars known in the ω Cen field, based on J- (top) and K_S-band bottom light curves. The overplotted lines define representative loci of “OoII-like” (dashed lines) and “OoI-like” (dotted lines) behavior for the ab-type RRL, obtained as described in the text. RRab stars with documented Blazhko effect are marked with open circles. Clearly, V180 has too large an amplitude for its claimed RRc status; instead, we believe that the star is a contact binary of the W UMa type with twice the alternative “RRc-like” period. V151 is clearly an RRc star.