Fit of the spectral energy distribution of 4C12.50. The infrared part of the spectrum was fit with a modified black body at long wavelengths (red dashed-dotted line) and with a power-law representing a series of modified black bodies at short wavelengths (red thick line). The total infrared model is plotted with a solid orange line. A broken power-law approximation with exponential cutoff is used for the radio emission. Minimum and maximum synchrotron flux models are given for the radio to optical range (solid cyan curve and dotted cyan curve, respectively; see the text for more details). A maximum model for the inverse Compton emission in the X-rays is shown with a dashed line.