Correlation between λ_tr and λ_peak. The circles are NSXRBs, while the dots show the BH counterparts. The data are taken from the literature (Yu & Yan 2009; Yan & Yu 2017; Cúneo et al. 2020). The solid lines are the model calculations for BHXRBs (i.e., ξ_c = 1), and the dashed lines are for NSXRBs (i.e., ξ_c = 0.1). The different colors indicate the results calculated with different values of the viscosity parameter: α = 0.05 (yellow), 0.07 (magenta), 0.1 (cyan), 0.15 (red), 0.2 (green), 0.3 (blue), and 0.4 (black). The stars indicate the case of the radiation pressure equaling the gas pressure in the outer disk at R_tr. The transition radius r_tr = 20 is adopted in all calculations.