Spectral energy distribution of four CoRoT targets. The observed magnitudes are converted to fluxes and normalised to the band with the smallest photometric error (red dots with error bars). The FOSC returns the best matching pair of spectral type and E_B−V in the library of templates. Their values are given in the top right corner of every plot, and the corresponding spectrum is over-plotted in solid black line. The match is obtained by computing the flux of the reddened templates convolved by the filters’ response, , represented as purple dots. The purple box width gives the bandwidth of the corresponding filter.