Observed MOS1 spectrum in the center region of MCXC J0157.4−0550 with various fitting model components. In the actual fitting, all 24 spectra are jointly fitted with the common model. The red points show the observed spectrum with the instrumental background subtracted. The red solid line is the sum of all the components. The blue, magenta, orange, and green dotted lines are the thermal emission spectrum of the cluster, Galactic diffuse emission, CXB, and the residual soft proton component, respectively. The light-blue line is the RASS spectrum. (Color online)