[APBeta] Sky Tab NELM Contour Issue

[Sean McGivern]

I have found what is all but certain to be a bug, but I'm not sure how I
managed to get it.

In one of my plan files, the Sky Tab NELM contours should a NELM maximum of
7.83, which is probably a bit high for just about anywhere :).  It popped up
as I was playing around with setting the NELM (mag/sq.arcsec) of my site.
However, I can't at the moment reproduce it from a new plan.  I'm happy to
send the plan in if that would be helpful.

I have also noticed that the Sky Tab magnitudes do not appear to respect the
Bortle setting on the site settings.  I manually set the mag/sq.arcsec to
20.5 as an estimate of my best NELM of 5.7 (this was somehow what caused the
above, I think).  However, the maximum NELM in the contour plot is 6.32
(when I set the date to around the new moon after astronomical twilight --
plot is nicely symmetric).  Even if I reset my Bortle to a super-dark site
and restart the program and/or create a new plan, I get the same behavior.
I just confirmed that this doesn't change if I set my site to Inner City
skies and reopen the program and start a new plan.

The contour plot looks like it is refreshing (I see the swirl on the lower
right side) whenever I change that value, but the plot doesn't change.  It
does change sensibly when I change the date (based on presence of sun and/or
moon).

Is there a behavior I'm missing?  Shouldn't the NELM contour respect the
site?

BTW, VERY cool feature.

Sean McGivern
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