Top: Bailey diagram of bulge and ω Cen T2Cs in the V band. Gray shows bulge BLHs, red crosses present bulge pWVs, and the other symbols are for ω Cen T2Cs and have the same meaning as in Figs. 1 and 4. The uncertainties of the light-curve amplitudes of ω Cen T2Cs are displayed as black error bars. Middle: same as in the top panel, but for the I band. The OGLE catalogs do not provide the uncertainties on the Amp(I), therefore we assumed an uncertainty of 0.05 mag. This is a conservative assumption because the median of the uncertainties on Amp(V) is 0.052 mag, and the I-band time series of OGLE have about one order of magnitude more points than the V-band time series. Bottom: same as in the top panel, but for the K_s band.