\begin{table}%t1 \caption{\label{rrlprop}Properties of the RR~Lyrae stars.} %\centerline {\small \begin{tabular}{l l c c r l c c c} \hline\hline ID & Type & $\alpha$ [hms] & $\delta$ [dms] &$d$ [\arcsec]& $P$ [d] & $SNR$ & $V$ & $V-I$ \\ \hline V1 & RRab & 13:12:56.3 & 18:07:13.8 & 176.8 & 0.6098298(9) & 14.3 & 16.970 & 0.579 \\ V2 & RRc & 13:12:50.3 & 18:07:00.8 & 202.0 & 0.386122(1) & 22.2 & 16.879 & 0.402 \\ V3 & RRab & 13:12:51.4 & 18:07:45.5 & 154.6 & 0.630605(1) & 17.8 & 16.848 & 0.447 \\ V4 & RRc & 13:12:43.9 & 18:07:26.4 & 230.3 & 0.385545(1) & 26.0 & 16.800 & 0.383 \\ V5 & RRab & 13:12:39.1 & 18:05:42.6 & 353.3 & 0.639426(1) & 23.2 & 16.888 & 0.526 \\ V6 & RRab & 13:13:03.9 & 18:10:19.8 & 123.7 & 0.664020(1) & 14.4 & 16.819 & 0.522 \\ V7 & RRab & 13:13:00.9 & 18:11:29.7 & 113.3 & 0.5448584(6) & 13.5 & \dots & \dots \\ V8 & RRab & 13:13:00.4 & 18:11:05.1 & 92.3 & 0.615528(1) & 16.1 & \dots & \dots \\ V9 & RRab & 13:13:00.1 & 18:09:25.0 & 81.9 & 0.6003690(7) & 15.2 & \dots & \dots \\ V10 & RRab & 13:12:45.7 & 18:10:55.6 & 143.3 & 0.6082612(7) & 18.8 & 16.837 & 0.463 \\ V11 & RRabB & 13:12:45.4 & 18:09:01.9 & 156.3 & 0.629940(5) & 12.2 & \dots & \dots \\ V14 & RRab & 13:13:20.5 & 18:06:42.8 & 415.6 & 0.5454625(7) & 14.0 & 16.880 & 0.452 \\ V15 & RRc & 13:13:12.4 & 18:13:55.0 & 332.5 & 0.3086646(9) & 21.6 & 16.894 & 0.342 \\ V16 & RRcB & 13:12:46.2 & 18:06:39.2 & 247.3 & 0.3031686(7) & 18.7 & \dots & \dots \\ V17 & RRc & 13:12:40.4 & 18:11:54.1 & 236.7 & 0.381282(1) & 27.5 & 16.848 & 0.422 \\ V18 & RRc & 13:12:48.7 & 18:10:12.9 & 93.9 & 0.336054(1) & 22.2 & \dots & \dots \\ V19 & RRc & 13:13:07.0 & 18:09:26.1 & 173.2 & 0.391377(1) & 28.1 & 16.880 & 0.437 \\ V20 & RRc & 13:13:09.0 & 18:04:16.2 & 404.7 & 0.384337(1) & 22.5 & 16.875 & 0.407 \\ V23 & RRc & 13:13:02.3 & 18:08:35.9 & 137.9 & 0.365804(1) & 25.2 & 16.825 & 0.391 \\ V24 & RRab & 13:12:47.2 & 18:09:33.0 & 120.4 & 0.763198(2) & 20.3 & \dots & \dots \\ V25 & RRab & 13:13:04.4 & 18:10:37.2 & 133.5 & 0.705162(1) & 16.7 & 16.779 & 0.555 \\ V26 & RRc & 13:12:35.7 & 18:05:20.5 & 401.7 & 0.391106(1) & 24.1 & 16.845 & 0.395 \\ V27 & RRab & 13:12:41.4 & 18:07:23.9 & 257.9 & 0.671071(1) & 14.7 & 16.856 & 0.550 \\ V28 & RRab & 13:12:42.1 & 18:16:37.9 & 430.9 & 0.6327804(7) & 16.5 & 16.875 & 0.545 \\ V29 & RRab & 13:13:04.3 & 18:08:46.9 & 152.9 & 0.823243(4) & 26.6 & 16.782 & 0.588 \\ V31 & RRab & 13:12:59.6 & 18:10:04.6 & 61.9 & 0.705665(1) & 15.2 & \dots & \dots \\ V32 & RRc & 13:12:47.7 & 18:08:35.9 & 142.6 & 0.390623(2) & 20.4 & 16.712 & 0.416 \\ V33 & RRab & 13:12:43.9 & 18:10:13.2 & 162.5 & 0.6245815(8) & 16.9 & \dots & \dots \\ V34 & RRc & 13:12:45.7 & 18:06:26.1 & 262.0 & 0.289611(1) & 21.2 & 16.928 & 0.314 \\ V35 & RRc & 13:13:02.4 & 18:12:37.5 & 179.8 & 0.372666(2) & 22.7 & 16.943 & 0.442 \\ V36 & RRc & 13:13:03.3 & 18:15:10.2 & 321.8 & 0.373242(1) & 21.5 & 16.879 & 0.414 \\ V37 & RRab & 13:12:52.3 & 18:11:05.1 & 69.6 & 0.717615(1) & 21.0 & \dots & \dots \\ V38 & RRab & 13:12:57.1 & 18:07:40.5 & 151.8 & 0.705792(2) & 21.2 & 16.749 & 0.557 \\ V40 & RRc & 13:12:55.9 & 18:11:54.7 & 105.3 & 0.3147939(9) & 19.6 & \dots & \dots \\ V41 & RRab & 13:12:56.8 & 18:11:09.3 & 63.6 & 0.614438(1) & 19.2 & \dots & \dots \\ V42 & RRab & 13:12:50.6 & 18:10:19.5 & 67.4 & 0.713717(2) & 21.8 & \dots & \dots \\ V43 & RRab & 13:12:53.1 & 18:10:55.7 & 55.5 & 0.712017(2) & 24.2 & \dots & \dots \\ V44 & RRc & 13:12:51.5 & 18:09:58.2 & 54.6 & 0.375099(2) & 23.7 & \dots & \dots \\ V45 & RRab & 13:12:55.2 & 18:09:27.4 & 42.4 & 0.654950(2) & 16.2 & \dots & \dots \\ V46 & RRab & 13:12:54.6 & 18:10:36.2 & 28.1 & 0.703655(3) & 22.0 & \dots & \dots \\ V47 & RRc & 13:12:50.4 & 18:12:24.6 & 151.4 & 0.335377(1) & 21.1 & 16.791 & 0.372 \\ V51 & RRc & 13:12:57.8 & 18:10:50.7 & 54.7 & 0.355203(2) & 20.2 & \dots & \dots \\ V54 & RRc & 13:12:54.4 & 18:10:31.4 & 25.0 & 0.315122(3) & 14.2 & \dots & \dots \\ V55 & RRc & 13:12:53.6 & 18:10:39.2 & 37.7 & 0.443386(2) & 26.4 & \dots & \dots \\ V56 & RRc & 13:12:53.7 & 18:09:29.1 & 46.3 & 0.328796(2) & 15.1 & \dots & \dots \\ V57 & RRabB & 13:12:55.5 & 18:09:58.0 & 12.1 & 0.568234(7) & 11.8 & \dots & \dots \\ V58 & RRc & 13:12:55.6 & 18:09:30.8 & 39.4 & 0.354954(3) & 17.2 & \dots & \dots \\ V59 & RRc & 13:12:56.7 & 18:09:20.4 & 53.4 & 0.303941(2) & 19.7 & \dots & \dots \\ V60 & RRab & 13:12:57.0 & 18:09:36.0 & 41.6 & 0.644755(2) & 18.4 & \dots & \dots \\ V62 & RRc & 13:12:54.0 & 18:10:30.1 & 27.0 & 0.359891(4) & 13.8 & \dots & \dots \\ V63 & RRc & 13:12:56.2 & 18:10:02.8 & 15.5 & 0.310476(4) & 14.3 & \dots & \dots \\ V64 & RRc & 13:12:52.6 & 18:10:12.5 & 38.5 & 0.319529(1) & 19.2 & \dots & \dots \\ V71* & RRc & 13:12:54.5 & 18:09:54.3 & 18.8 & 0.304242(5) & 14.5 & \dots & \dots \\ V72* & RRc & 13:12:55.8 & 18:09:50.6 & 20.7 & 0.254155(3) & 13.5 & \dots & \dots \\ \hline \end{tabular}} \medskip Notes: \\ The radial distance $d$ [\arcsec] is measured from the nominal cluster center defined in Stetson's catalog of photometric standards (\citealt{standards}; $\alpha=13^{\rm h}12^{\rm m}55\fs26$; $\delta=+18\degr10\arcmin09\farcs 8$ [2000.0]); errors corresponding to the last digits of the periods are shown in parentheses (see Sect.~\ref{gendesc} 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.~\ref{method} and Fig.~\ref{plc-test}); 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. \end{table}