Conversion factor between observed CoRoT flux and bolometric flux as a function of spectral parameters/shape and extinction. The ratio is plotted as a function of temperature for different source spectra. All solid lines refer to unabsorbed source spectra. The four thin red lines refer the stellar case with four values of log g between 3.0 and 4.5. The thicker red line shows the mean of the four values at each T_eff. The black line refers instead to black body emission spectra. The dotted red and black lines show the ratio for the stellar and black-body cases, respectively, for an A_V = 1.0 mag interstellar extinction.