Panels a and b: Black crosses show the randomly extracted K_s-band phase points over the light curve of the RRc variable ωCen-V83. Grey dashed lines display the fit of the light-curve template (Fourier, a; PEGASUS, b) to the extracted phase points. The ID of the RRL is labelled. Panels c and d: Same as panels a and b, but for the RRab variable ωCen-V107. The RRab1 light-curve templates were adopted. Panels e and f: Same as panels a and b, but for the RRab variable ωCen-V125. The RRab2 light-curve templates were adopted. Panels g and h: Same as panels a and b, but for the RRab variable ωCen-V15. The RRab3 light-curve templates were adopted.