Distances to (a) G134.7−00.3 with A_G and (b) G112.2−01.5 with A_V. Right-hand plots of both panels: dashed red line is the baseline obtained with off-cloud stars, and the broken horizontal purple line is the extinction variation of on-cloud stars after subtracting the baseline. In the CO image insets, the green and light blue points represent samples of on- and off-cloud stars, respectively. The red line delineates the boundary of molecular clouds, while the green line is the lower cutoff of CO emission toward on-cloud stars. In the CO image insets of panel a, the off-cloud region is selected to be close to the on-cloud region to accurately remove irregular extinction variations of on-cloud stars. The left corner maps are the MCMC sampling results of five parameters: the distance (D), the mean and standard deviation of foreground extinction (μ₁ and σ₁), and the mean and standard deviation of background extinction (μ₂ and σ₂). The error ofdistances is the 95% highest posterior densities, about two standard deviations for Gaussian distributions. Further details are available in Yan et al. (2019a).