Weighted linear least-squares fit performed over the M_K magnitude of the five RR Lyrae stars in Benedict et al. (2011) using the M_K values inferred from the HST parallaxes with (red solid line) and without (red dashed line) Lutz-Kelker correction and the M_K values (blue filled circles) inferred from the TGAS parallaxes (black line). Green filled and open circles show the Type II Cepheid VY Pyx with the M_K magnitude determined from the TGAS and HST parallax, respectively. The star was not used in the fit.