Spectroscopic criteria used to select CTTSs and WTTSs in NGC 2264. CTTSs are shown as asterisks and WTTSs as plus signs. Top: Hα equivalent width vs. spectral type for our sample of stars. Dashed horizontal lines represent the White & Basri (2003) classification threshold and solid horizontal lines the Fang et al. (2009) proposed criteria. Bottom: Hα equivalent width vs. Hα width at 10% of maximum intensity. The dashed vertical line is drawn at 270 km s^-1, the separation between CTTSs and WTTSs, according to White & Basri (2003). A few stars do not satisfy one spectroscopic CTTS criterion, but they were classified as CTTSs either based on the other spectroscopic criterion or on the UV excess.