Top: contour image of the emission integrated under the 5₀  →  4₀A transition line, overlaid on the greyscale 1.2 mm continuum emission of G11.11P1. First contour and contour spacing are 0.16 Jy beam^-1 km s^-1 (3σ); the dashed contours show the negative emission (− 3σ). The synthesized beam (26  ×  11; PA = 174°) is shown in the lower right corner. The dotted circle indicates the interferometer primary beam (21″) at this frequency. Bottom: spectrum of CH₃OH 5_k  →  4_k toward the position: RA = 18^h10^m2840, Dec = −19°22′319 (J2000). The HNCO 11_0,11  →  10_0,10 line (at 241 774.0320 MHz with E_u/k = 69.67 K and μ²S = 27.4590 D²) is shown as well. The “G” shows an artifact produced in the central channels of a correlator unit by the Gibbs effect.