Top: ϕ₂₁ − log P diagram of long-period RRLs and short-period T2Cs in ω Cen and Galactic bulge. Red dots present RRab, blue dots show T2Cs (I-band Fourier coefficients), and magenta dots present T2Cs (V-band Fourier coefficients). Middle: same as the top panel, but for the ϕ₃₁ coefficients. The green box contains variables in the short-period T2C sample, the black box contains variables in the candidate RRL sample, and the light blue box contains variables in the RRL template sample. Bottom: bailey diagram of the same variables as in the top and middle panel. Light blue, black, and green cicles display variables in the short-period T2C, candidate RRL, and RRL template samples, respectively.