[AstroPy] [EXTERNAL] Help with negative-dex type unit

[Derek Homeier]

Hi Nathaniel,

> On 30 Jun 2020, at 5:34 am, Livesey, Nathaniel J (US 3290) <nathaniel.j.livesey at jpl.nasa.gov> wrote:
> 
>  Many thanks indeed, that did exactly what I had in mind.  Much appreciated!

by way of a late follow-up, this topic just came up again amidst some more general discussion on logarithmic units.

Summary: there is a 1-step recommended alternative

zhPa = u.LogUnit(u.hPa, '-1 dex')

More details on
https://github.com/astropy/astropy/issues/10577

– suggestions for how to better document this are very welcome.

Cheers,
					Derek