Re: How to keep FITS header when stacking?
Posted by
Luca on
Aug 17, 2017; 1:21pm
URL: http://astroimagej.170.s1.nabble.com/How-to-keep-FITS-header-when-stacking-tp725p783.html
Alright, thanks!

This is how the focus changed during the night, so basically what WIDTH_T1 detrending does is linearly correct the change in FWHM size.
If so, the linear detrend did wonders even with that messy focus trend, implying that this might be a big source of error in our data.