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$\begin{figure} \par\includegraphics[width=8cm,clip]{7962F1.eps}\end{figure}$ Figure 1: Schematic representation of the electron injection spectrum and the stationary differential number density as a function of $\gamma$ . The heights of the spectra have been adjusted for easy comparison and are not to scale. The solid line shows the double power-law injection spectrum with power-law index s₁ for $\gamma <\gamma _{\rm p}$ , and s₂ for $\gamma >\gamma _{\rm p}$ . The dashed line shows the case where $\gamma _{\rm cool}=\gamma _{\rm cool}^{\rm (R)}>\gamma _{\rm p}$ . The differential electron number density $n_{\rm e}\propto \gamma ^{-s_1}$ in regions A and B, $n_{\rm e}\propto \gamma ^{-s_2}$ in region C, and $n_{\rm e}\propto \gamma ^{-(s_2+1)}$ in region D. The dotted line shows the case where $\gamma _{\rm cool}=\gamma _{\rm cool}^{\rm (B)}<\gamma _0$ , with $n_{\rm e}\propto \gamma ^{-s_1}$ in region A, $n_{\rm e}\propto \gamma ^{-2}$ in region B, and $n_{\rm e}\propto \gamma ^{-(s_2+1)}$ in regions C and D.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{7962F2.eps}\end{figure}$ Figure 2: Spectral energy distribution of S5 0716 +714. Multi-frequency simultaneous data from Ostorero et al. (2006) are shown as black symbols. Black dots show data points, variation ranges are shown by a vertical bar between two symbols, and downward arrows show upper limits. Values of the parameters are shown in Table 1. The model spectra are computed from a distribution of monoenergetic electrons and are shown with solid and dashed lines. The dashed line shows the strong-magnetic-field model where the parameters are chosen such that it goes through the data points at optical frequency, whereas the solid line shows weak-magnetic-field model where the parameters are chosen to mimic the spectral turning at 10^11.5 Hz. The values of the parameters are shown in Table 1.
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In the text

$\begin{figure} \par\includegraphics[width=12cm,clip]{7962F3.eps}\end{figure}$ Figure 3: The spectral energy distribution of S5 0716 +714, as represented in Fig. 2. The model spectra, shown as solid and dashed lines, are computed from a quasi-monoenergetic electron distribution in the form of Eq. (12). The dashed line represents the low-Doppler-factor model where the Doppler boosting factor is minimised, whereas the solid line shows the high-Doppler-factor model where the values of the parameters are chosen to account for all radio and optical data points. The dashed gridline shows the position of 32 GHz. The values of the parameters are shown in Table 1. Historical data, as compiled by Ostorero et al. (2006) and shown as grey symbols, at radio-to-optical frequencies are from Kuehr et al. (1981), Waltman et al. (1981), Eckart et al. (1982), Perley (1982), Perley et al. (1982), Lawrence et al. (1985), Saikia et al. (1987), Kuehr & Schmidt (1990), Moshir et al. (1990), Hales et al. (1991), Krichbaum et al. (1993), Gear et al. (1994), Hales et al. (1995), Douglas et al. (1996), Rengelink et al. (1997), Zhang et al. (1997), Riley et al. (1999), Cohen et al. (2002), Raiteri et al. (2003); UV data from Pian & Treves (1993), Ghisellini et al. (1997); X-ray data from Biermann et al. (1992), Comastri et al. (1997), Kubo et al. (1998), Giommi et al. (1999), Tagliaferri et al. (2003), Pian et al. (2005); and $\gamma$ -ray data from McNaron-Brown et al. (1995), Hartman et al. (1999), Collmar (2006).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7962F4a.eps}\par\includegraphics[width=7.5cm,clip]{7962F4b.eps}\end{figure}$ Figure 4: The spectral energy distribution of S5 0716 +714 and the model spectra, as represented in Fig. 2, in the radio-to-optical band. Top panel shows the low-Doppler-factor model where the Doppler boosting factor is minimised. Bottom panel shows the high-Doppler-factor model where the values of the parameters are chosen to account for all radio and optical data points.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7962F5a.eps}\par\includegraphics[width=7.5cm,clip]{7962F5b.eps}\end{figure}$ Figure 5: Cooling rates normalised to the synchrotron loss rates (dashed lines at $\dot{\gamma}=\dot{\gamma}_{\rm s}$ ). The rate for inverse Compton scattering is shown as a dotted line, the total loss rate as a thin solid line (blue online). The approximate rate used to compute the electron distribution is shown as a thick solid line (black online). The top ( bottom) panel shows the results of the low(high)-Doppler-factor model shown as dashed (solid) lines in Fig. 3. The vertical dotted lines correspond to $\gamma =a\gamma _{\rm cool}$ (see Eq. (12)) on the left, and to $\gamma =\gamma _{\rm max}$ on the right.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{7962F4a.eps}\par\includegraphics[width=7.5cm,clip]{7962F4b.eps}\end{figure}$	Figure 4: The spectral energy distribution of S5 0716 +714 and the model spectra, as represented in Fig. 2, in the radio-to-optical band. Top panel shows the low-Doppler-factor model where the Doppler boosting factor is minimised. Bottom panel shows the high-Doppler-factor model where the values of the parameters are chosen to account for all radio and optical data points.
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