Table 3: CTTS properties.

Star		 Stellar Age Ne/O $T_{\rm med}^b$ $N_{\rm e}$
  Associationa (Myr)   (MK) ${\rm (10^{11}~cm^{-3})}$
BP Tau Taurus 0.6c 0.43d 16.1d 3.2d $\hspace{1.5em}$
TW Hya TWA 8e 0.87f 4.8d 21.1d $\hspace{1.5em}$
V4046 Sgr BPMG 12g 1.04h 6.4h 3.2h $\hspace{1.5em}$
MP Mus LCC 17i 0.46 8.5 $\hspace{0.4em}$ 5.0 $\hspace{1.9em}$
a TWA = TW Hydrae association, BPMG = $\beta$ Pictoris Moving Group, LCC = Lower Centaurus Curx; b  $T_{\rm med}$ is derived as $(\Sigma_{i}EM_{i}~T_{i})/(\Sigma_{i}EM_{i})$; c Gullbring et al. (1998); d Robrade & Schmitt (2006); e Makarov & Fabricius (2001); f Drake et al. (2005); g Zuckerman et al. (2001); h Günther et al. (2006, $T_{\rm med}$ has been derived from the line fluxes); i Mamajek et al. (2002).

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