Left: Same as Fig. 7, but for random extraction on the light curve of the RRab variable ωCen-V125 (RRab2). In this specific case the three randomly extracted phase points are close in phase. The J96 fit does not provide an accurate estimate of the mean magnitude. Right: Same as the left, but for an extraction where the three randomly extracted phase points have a smaller difference in phase. In this case the light-curve templates do not provide an accurate estimate of the K_s band mean magnitude.