Comparisons of predicted SEDs and observed data for mature/old PWNe (from upper left panel for HEES J1356-645 to bottom right panel for HESS J1303-631). In each panel, the black line represents the synchrotron SED; magenta, blue, green, and cyan lines represent the SEDs of inverse Compton scatterings with the synchrotron photons, IR, CMB, and starlight, respectively; and the total SED is shown by the red line. See text for the descriptions of the observed data; the relevant parameters are listed in Table 3.