Difference between the observed V_LSR and the expected V_LSR as a function of Galactic longitude, for the Cepheid candidates in the bulge and disk regions. The expected V_LSR values were estimated using the MW rotation curve determined by Mróz et al. (2019). For this purpose the distances were calculated for each star using the Macri et al. (2015) PL relations (i.e., assuming that all of them are CCs; see text for details). Therefore, the observed velocities of those stars having large velocity differences would not be compatible with them actually being CCs. The horizontal red dashed lines indicate velocity differences of ΔV_LSR = ±30 km s⁻¹ between the observed and expected values. The error bars for the measured velocities are, in general, lower than the point size in this figure.