Spatial distribution of NGC 2264 members investigated in this study. Small grey dots represent all objects in the sample (Table 4); periodic sources with single periodicity detected are highlighted as black dots; blue/red circles (on the left-side diagram) and triangles (right-side diagram) identify periodic sources with periods in the 1–2 d range and in the 3–4 d range, respectively; blue corresponds to WTTS, red to CTTS. The dashed lines delimit the various regions/subclusters identified, within the cloud, by Sung et al. (2009) after Sung et al. (2008) and Teixeira et al. (2006). North is up and east is left on the spatial diagram.