New calibrated RR Lyrae Ks-band Period-Luminosity relations
(PLRs) in globular clusters with different mean-metallicities.
The distances to the globular clusters were determined using Gaia EDR3
based zero-point calibration for RR Lyrae stars. The residuals of the
Period-Luminosity-metallicity (PLZ) relations do not show any trend
with metallicity seen in the PLRs in the top panel.