One simulated LoS example of 900 Monte Carlo simulations for validation of the Bayesian method. In the left panel, the blue crosses stand for the 94 template BHB stars; the red points are selected field stars with random reddening values and random Gaussian noises in photometry. The right panel shows the contour of the posterior probability of the reddening E(u − g) and E(g − r) estimated from the Bayesian method. The large blue cross marks the most likely reddening value with a 1σ error.