Period-M_bol and PR relations. The error bars in M_bol are plotted but are typically smaller than the symbol size. The symbols are follows: filled squares (SMC), open squares (LMC), open triangles (M31), filled triangles (M33), filled circles (Galactic Bulge), and open circles (MW). Stars located outside the bulk of objects are identified. The blue lines give the relation for LMC CCs from Groenewegen & Lub (2023) while the red lines give the recommended solution for LMC T2Cs from Groenewegen & Jurkovic (2017). GD-CEP-1505 is located outside the upper plot at log P ~ 1.7 and M_bol –0.6 mag.