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In studying column abundances, I often encounter the units $pr-\mu m$. What does this stand for? Part per micrometer? how can this be an abundance unit?

Incredibility I cannot figure out what it means after quite a bit of online searching.

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  • $\begingroup$ Likely per micrometer. The pr is not standard. I imagine it would be commonly used in display technology and micofabrication for density. In molecular fields you have the related ppm for parts per million. $\endgroup$ – Paul Childs Jun 6 at 1:03
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Looks like it is precipitable microns (https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2006JE002695)

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