Comparison of H₂ and CO quantities observed in MBM12 with Herschel and TRAO. We compare N(H₂) with CO linewidths W(CO), X-factors X(CO), ¹²CO excitation temperature T_ex, CO column density N(CO)_lte, and CO abundances [CO/H₂]_lte. Panels a)-c) and d)-l) have different colour scales. Panels d)-f) have linear fits shown in black lines, with the slope annotated on the respective panel. The linear striations at low N(H₂) in panels j) and k) are artefacts of the sigma clipping in the W(CO) estimates.