[SQM] NELM

[JPDarkSkies at aol.com]

The Knightware software used with the SQM-LU offers NELM readings as well  
as Mag/sq ArcSecs.
Where can I find a clear definition of NELM, what are the units and is  
there a conversion formula from Mags to NELM.
 
John Prockter
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