Channel maps of the ¹²CO J = 1−0 and J = 2−1 line emission (in contours) toward IRAS 20028+3910 at the LSR velocities (units of km s^-1) specified in the top-left corner of each panel. No primary beam attenuation correction is applied. (Top) CO J = 1−0: contours are superposed on HST images by Ueta et al. (2000), and plotted from 2.6σ, with a spacing of 3σ, where σ = 7.1 mJy beam^-1. In the panels marked with c in the bottom-left corner the first contours are at 6, 10, 15, 21, 27, 34σ and from there every 15σ. Equivalent negative contours are plotted in dashed lines. The last panel presents the continuum emission with a first contour and contour spacing of 3σ, where σ = 0.5 mJy beam^-1. The synthesized beam, plotted in the bottom-right corner of last panels, is in size, with PA 76°. (Bottom) CO J = 2−1: contours are superposed on HST images by Ueta et al. (2000). They are plotted at 2.5, 6, 10, 16σ and from there with a spacing of 10σ, where σ = 15 mJy beam^-1. In the panels marked with c in the bottom-left corner the first contours are at 5, 10, 16σ and from there every 10σ. Equivalent negative contours are plotted in dashed lines. The last panel presents the continuum emission with a first contour and contour spacing of 3σ, with σ = 1.7 mJy beam^-1. The synthesized beam, plotted in the bottom-right corner of last panels, is in size, with PA 50°. The central coordinates are RA 20:04:35.96, Dec 39:18:44.8 (J2000).