Comparison of model SED to observations. Blue bullets are photometric data points used for the fitting (see Table 2). Light blue symbols refer to other, unused photometry points. Symbols with downward arrows indicate 3σ upper limits. The black line is the SED from our best-fitting model. The red line shows the assumed stellar input spectrum, completed by piecewise constant fluxes F_ν in three UV bands as obtained by integrating over our UV observations (Table 3).