Multiband spectrum of CTA 102, where we illustrate in more detail the procedure for choosing input parameters for the model used in the text. Hatched region: Estimated range of νSSC and LSSC. Lines bounding shaded area: (a) a linear extrapolation of the ASCA spectrum; (b) the highest value of νF(ν) measured by ASCA; (c) (νSSC, LSSC) for δ = 5; (d) (νSSC, LSSC) for δ = 20. Filled circle in hatched region: Point that is used in the calculation of magnetic field B and electron Lorentz factor γb. The data used are from sources as given in Fig. 2; in addition, we used Nolan et al. (1993) and Padovani (1992).