Comparison between the LMC and SMC PWJK relation to determine the relative distances (see labels). In the top panel, red and blue filled circles are, respectively, the LMC and SMC F mode ACs, while the red and the blue solid lines are the fitted PL relations in the corresponding Cloud. In the middle panel, the green and yellow filled circles are respectively the LMC and SMC F mode ACs, while the green and the yellow solid lines are the fitted PL relations in the corresponding Cloud. In the bottom panel, the red filled and empty circles are respectively the LMC F mode and fundamentalized 1O mode ACs; blue filled and empty circles are respectively the SMC F mode and fundamentalized 1O mode ACs, while the red and the blue solid lines are the fitted PWJK relations in the corresponding Cloud.