The v₂ = 1, J = 13 direct ℓ-type line of HCN observed toward several positions in G10.47+0.03 (left column), SgrB2-N (central column), and SgrB2-M (right column). The emission lines are averaged over the areas shown in Figs. 2, 4, and 6, while the absorption lines are observed with the beams given in Table 1. Overlaid in green are Gaussian fits, whose parameters are given in Tables 2 and 3. The vertical dashed lines mark the assumed systemic velocities.