a) The P-C relation in (V − I) of WLM. Full dots are P0 Cepheids throughout, crosses P1 Cepheids, and open diamonds excluded variables. The thick line is the P-C relation of SMC for P0, the thin line for P1 Cepheids. b), c) The P-L relations in V and I of the same objects as in a). The full lines are the P-L relations of the P0 (thick line) and P1 (thin line) Cepheids in SMC, shifted in magnitude to fit the WLM data. The similarity of the WLM and SMC Cepheids is apparent. d) The internal color excesses E(V − I) of the P0 and P1 Cepheids in WLM as a function of log P inferred from a comparison with the adopted SMC templets. – e), f) The individual true distance moduli of the P0 and P1 Cepheids as a function of log P inferred from a comparison of the true apparent V and I magnitudes with the corresponding SMC templets. The full line is a fit to only the P0 Cepheids; their equations are indicated at the bottom of the panels. The mean distances are read at the indicated median period P_med.