ALMA Band 6 moment-zero images of the COM-rich sources analyzed in this study: B1-c (left), S68N (middle), and B1-bS (right). In color the spatial distribution of CH₃ OH 2_1,1 –1_0,1 (top row, E_up = 28 K) and CH₃ OCHO 21_7,14 –20_7,13 emission (bottom row, E_up = 170 K) is shown, with the color scale shown on top of each image. The images are integrated over [− 10,10] km s⁻¹ with respect to the V_lsr. In the color bar, the 3σ_line level is indicated with the black bar, with σ_line = 4.0, 4.9, and 4.4 mJy beam⁻¹ km s⁻¹ for B1-c, S68N, and B1-bS, respectively. The continuum is shown with the black contours with increasing [3,5,8,12,18,21,30] σ_cont, where σ_cont is 1.5, 0.8, and 1.0 mJy beam⁻¹ km s⁻¹ for B1-c, S68N,and B1-bS, respectively. The size of the beam is shown in the lower right of each image, and in the lower left a scale bar is displayed. The image of B1-bS has a lower S/N since the source is located on the edge of the primary beam.