Light curve comparison for a sample RR Lyrae star. The upper left panel visualises the Pan-STARRS light curve of the star, in all five filters, and the lower left panel shows the light curve phase-folded with the period given in the (Sesar et al. 2017) catalogue. In order to make the periodicity more transparent, we shifted the AB magnitude levels of each filter’s light curve by adding 0, 1, 2, 3, 4 magnitudes to the g, r, i, z, y filter light curves. The upper right panel illustrates the K2 light curve, while the lower right panel shows the light curve phase-folded with the period that was determined by the Lomb–Scargle periodogram method.