a) The spectral-type distribution of our spectroscopic sample. The filled histogram shows the distribution of stars without X-ray emission. The open histograms display the distribution of X-ray emission stars. The dotted line connecting filled circles show the predicted distribution of spectral type for a 1 Myr cluster with an IMF like that of the Trapezium cluster. The distribution is normalized to the number of K4-K6 stars. b) The distribution of extinction for the spectroscopic sample. The filled histogram shows the distribution of stars without X-ray emission. The open histogram shows the distribution of X-ray emitting stars. The dash-dotted line denotes the Gaussian fit to the open histogram, peaking at A_V = 5.5 mag with a FWHM of 2.2 mag.