Comparison of phase-polarization curves under two fitting methods. The left and right panels demonstrate curve fitting using the nonlinear least-squares method (the Levenberg-Marquardt algorithm) and the Markov chain Monte Carlo method, respectively, using Eq. (7). The open red circles indicate the R_C band data of 1999 JD₆ in this work. The solid blue, dashed purple, and dotted cyan lines correspond to the Barbarians, L-type, and K-type asteroids, that is, the values of P_min we used for the fit. Both methods yielded similar convergent solutions in the Babarian model.