Microwave SED of 3C 58 from the radio through infrared. Data are as in Fig. 9 with the addition of lower-frequency radio flux densities (Green 2009) and higher-frequency IRAS and Spitzer flux densities, and omission of the ERCSC flux densities. The dashed line is the power-law fit to the radio flux densities; the dotted line is the pulsar wind nebula model; and the dash-dotted line is that model with the addition of a second break with spectral index 0.92 above 200 GHz.