deletions | additions       diff --git a/preprocessing.tex b/preprocessing.tex  index 4bc86fa..4489139 100644  --- a/preprocessing.tex  +++ b/preprocessing.tex 
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\verb|b_ifuyyyymmdd_hhmmss.fits| which has been debiased and degained.  \subsection{Preprocess -- Cosmic Ray Rejection}  Cosmic ray rejection  \subsection{Preprocess -- Background Subtraction}