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Fig. A.2

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Coadded HST-COS spectrum of HD 135344B smoothed and dereddened (see details in the text). F3V (HR 9028, IUE SWP 14002, red) and F4V (HD 27901, SWP 45935, blue) spectral type comparison stars are shown, scaled by the difference in V magnitudes between them and HD 135344B. HD 135344B shows a distinct FUV excess for wavelengths shortward of 1600 Å, demonstrating the accretion luminosity. The structure seen in the COS data is not noise, but fluorescent H2 emission (France et al. 2012). The rise in flux for the comparison stars shortward of H I Lyman α is an artefact. No correction in all of the spectra has been made for geocoronal Lyman α.

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