Notes:
The radial distance d [ ] is measured from the nominal cluster center defined in Stetson's catalog of photometric standards (Stetson 2000; ; [2000.0]); errors corresponding to the last digits of the periods are shown in parentheses (see Sect. 3.1 for details on the computation of the errors); the signal-to-noise ratio (SNR) was calculated in the [0.0,20.0] d^-1 frequency range; the V and V-I magnitude averages (i.e., the zero frequency constant in their Fourier decompositions) are given in those cases in which the flux-to-magnitude conversion was reliable (see Sect. 2 and Fig. 8); stars denote new detections, RRab, RRc and RRabB/RRcB stand for fundamental, first overtone and Blazhko variables, Fourier decompositions of the RR Lyrae stars with magnitude-transformed light curves in V color are available online at CDS.