the intensities of high overtone transitions computed with the standard compilation of the diatomic vibration-rotation program [Level]{} [@lr07]. Our line lists computed with [Level]{} have been adjusted to remove transitions which appeared to have been affected by this issue; such cases are noted below. The transitions removed are all very weak and it is anticipated that these changes will have very little effect on practical applications. We checked similar calculations performed with our in-house rovibronic program [Duo]{} [@jt609] and found similar behaviour: when the value of the transition dipole moment becomes comparable with the double precision error ($\approx 10^{-16}$ a.u.), the corresponding electric dipole intensities essentially represent numerical noise and have to be removed.

MgH
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The ExoMol MgH line list only considers transitions within the X $^2\Sigma^+$ ground electronic state [@jt529]. A line list containing A $^2\Pi$ – X $^2\Sigma^+$ and B$^\prime$ $^2\Sigma^+$ – X $^2\Sigma^+$ transitions has been given by GharibNezhad [[*et al*]{}]{} [@13GhShBe.MgH]. Both line lists are included in the ExoMol database.

Furthermore Szidarovszky and Császár [@15SzCsxx.MgH] showed that, due to the relatively low dissociation energy of MgH, consideration of quasi-bound states in the partition sum significantly alters the partition function at higher temperatures. However, for reasons 