Fig. 6
Gas-phase carbon abundance, compared with that of the Sun (dashed line, Asplund et al. 2009). From left to right: photospheric values for Herbig Ae/Be stars (Acke & Waelkens 2004; Folsom et al. 2012, stars); the stellar and disk values for HD 100546 (star and diamond, this work); the disk of TW Hya (diamond, this work); and lines of sight through the diffuse interstellar medium (Cardelli et al. 1996; Parvathi et al. 2012). For the Herbig Ae/Be and ISM samples, the median (black symbols) and the full dataset (small grey circles) are shown.
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