Comparison between model and observations for the N₂H⁺(J = 1−0) map observed at SEST. In each panel, the distance to the core center is indicated in arcseconds at the upper left side of the box. The reference coordinates of the map are α = 16^h32^m22.76^s, δ = –24°28′33.1″ (J2000), as given in Castets et al. (2001), which corresponds to a position close to the 16293-2422 protostar. This protostar is located ~90′′ northwest of the 16293E core center.