Panel (a): Soft X-ray band (0.3 − 2 keV). Panel (b): Hard X-ray band (2 − 7 keV). The color bar shows the ratio of the predicted and observed flux for the soft and hard bands. The allowed parameter space for α and β is the region where the ratio of the predicted flux to the observed flux is lower than 1, which satisfies the soft X-ray and hard X-ray observational constraints, respectively. The red line represents ratio of the predicted and observed flux equal to one.