Images of atomic hydrogen column density, ¹²CO and ¹³CO integrated intensities for (top row) MW-C20 and (bottom row) MW-C21. The N(H I) contour levels are (0.5, 1, 1.5)×10¹⁹ cm⁻² and (1, 2, 3, 4)×10¹⁹ cm⁻², respectively. While ¹²CO emission is visible in several regions of MW-C21, the broad velocity range with respect to the narrow velocity components dilutes the signal with excess noise. No ¹³CO J=1−0 emission is detected in either cloud. The red circles show the GBT half power beam width of the HI observations. The red circles in the lower right corner of the middle and right images denote the half power beam widths at ¹²CO and ¹³CO.