Mass derived from dust emission versus virial mass of the Cha I (a), c)) and Cha III (b), d)) cores computed for the transitions HC₃N 10−9, N₂H⁺ 1−0, C³⁴S 2−1, CH₃OH 2₀−1₀ A⁺, CH₃OH 2₁−1₁ E, C¹⁸O 2−1, and C¹⁷O 2−1. Panels a and b show the total mass of the cores while panels c and d show the mass obtained for a circular aperture of diameter 50′′. The solid line defines the region in which the cores are virialized (). The cores located to the right of the dotted line are considered to be gravitationally bound ().