Top: bulge T2Cs in the period-luminosity plane. Dark blue, light blue, and cyan circles mark BLHs, WVs, and RVTs, respectively. Red crosses mark pWVs. Bottom: close-up of the empirical PLK_s0 relation obtained by fitting BLHs and WVs in our sample (black solid line). Larger symbols display BLHs and WVs that were kept after an iterative 3σ clipping procedure. The purple, red, and green dashed lines display the literature PLK_s0 shifted by 14.6 mag (∼8.3 kpc) of Matsunaga et al. (2006), Groenewegen et al. (2008), and Bhardwaj et al. (2017a), respectively.