deletions | additions       diff --git a/preprocessing.tex b/preprocessing.tex  index 4489139..1cf3487 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 is handled by PyCosmic (see \cite{http://arxiv.org/abs/1208.1696}). It requires the input be debiased and in units of $e-$.  \subsubsection{Input}  A single data frame is taken (e.g., \verb|b_ifuyyyymmdd_hhmmss.fits|) and PyCosmic works its magic given a variety of parameters (not described here).  \subsubsection{Output}  The code outputs the cosmic-ray rejected filed (\verb|crr_b_ifuyyyymmdd_hhmmss.fits|) and the attendant mask file (\verb|mask_b_ifuyyyymmdd_hhmmss.fits|).  \subsection{Preprocess -- Background Subtraction}