Calibrated PLRs for Type II Cepheids in the LMC, Galactic globular clusters (GGC) and the Milky Way (solar neighbourhood). The red and green circles represent absolute magnitudes for T2Cs and RRLs with parallaxes in the Milky Way and the dashed red line is the best-fit linear regression. Plus symbols display PLR for VVV T2Cs with a zeropoint offset with respect to calibrated magnitudes. The error bars represent 1σ dispersion in the PLR in each galaxy. Grey dots display absolute magnitudes for RRLs in the LMC and globular clusters.
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