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1. 1. My current method (using a spline as the continuum; probably the most accurate but computationally intensive)
   2. fit a sloped line using the spectrum just before and just after the feature, and use that line as the continuum
   3. fit a flat line, i.e. same as above except simply use median of neighboring points.  Computationally quick but probably less accurate since some water features are at high slope.

Update 4/6/15

FWHM of all files

I collected all header info and FWHM of every file in the set (sans darks and flats).  Below is a scatter plot of FWHM vs date for all files:

Image Added

Image Added

(The two plots are the same, just different y-scales).  The bottom plot shows that there is still plenty of good data even towards the end, though the top plot shows that the number of out-of-focus images does increase with time.  There may even be some periodicity in the FWHM going out of focus.  

I was not sure how to best display such large datasets (~800k data points here), so if there are any suggestions feel free to let me know.

I will start analyzing the equivalent widths of all files tonight.