Gas velocity structure as a function of the distance to the OMC-1 South cloud for all the gas components detected with S/N ≥ 3 (gray squares). Different lines describe the expected velocity profile for a free-falling particle in a series of potential wells with different masses M observed at different angles α following Eq. (1) (see parameters in the lower right corner; masses are in M_⊙ and angles are in degrees).