deletions | additions       diff --git a/Pipeline steps.tex b/Pipeline steps.tex  index 3d8f066..5cf34da 100644  --- a/Pipeline steps.tex  +++ b/Pipeline steps.tex 
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\section{Pipeline steps}  \subsection{Makefile generator}  \subsubsection{Purpose}  From the headers of FITS files, identifies the purpose of each file. Each file is classified as one of:   \begin{itemize}  \item Arc lamp calibration -- used for wavelength solution  \item Flat field calibration -- used for trace location, spaxel flat, and pixel flat  \item Standard star -- used for throughput measurement  \item Science target (bright) -- usually single "A" pointing on science target.   \item Science target (faint) -- multiple dithered pointings on a science target.  \item Note that the same target may be observed multiple times in a single night and must be reduced as an independent observations  \end{itemize}  \subsubsection{Input}  List of fits files  \subsubsection{Output}  Makefile  \subsection{Trace finder}  \subsubsection{Purpose}  This piece of code identifies the location of all the traces on the detector. The traces are identified via sextractor. For each trace store the bounding box, the ridgeline of the trace (Chebyshev polynomial),