Spectra of the ground-state HFS transitions of CH at 3.264 GHz (in blue), 3.335 GHz (in red), and 3.349 GHz (in dark orange)and the N, J = 2, 3∕2 → 1, 1∕2 HFS deconvolved CH spectrum near 2006 GHz (in black) towards Sgr B2 (M) (left) and G34.26+0.15 (right). The LSR velocity scale for the 2006 GHz transition is set by the strongest HFS component. The spectra of the ground-state lines are offset from the baseline by 30, 20, and 10 K. The dashed grey lines mark the main spiral- and inter-arm components crossing the LOS towards each sight line, as discussed in the text. Gaussian fits to LOS velocity features that are common to all four transitions are displayed by the solid teal curve and the dotted teal curves indicate the different components observed within the envelope of the Sgr B2 (M), and G34.26+0.15 molecular clouds, respectively.