Hertzsprung-Russell diagram of the Lupus members. The evolutionary tracks of Baraffe et al. (2015) are shown as solid lines with the labels representing their masses. The isochrones at 1, 3, 10, 30, and 300 Myr by the same authors are shown with dashed lines. Big open circles denote subluminous objects. The green arrowhead indicates the position of the flat source SSTc2dJ160708.6-391408 (green filled square) when assuming the bolometric luminosity of 0.18 L_⊙ (Evans et al. 2009).