deletions | additions       diff --git a/Pipeline steps.tex b/Pipeline steps.tex  index 95d76cd..5a23237 100644  --- a/Pipeline steps.tex  +++ b/Pipeline steps.tex 
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\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),   \begin{itemize}  \end{itemize}  \subsubsection{Input}  \begin{itemize}  \item dome.fits -- bias subtracted flat field field (float).  \item seg_dome.fits -- segmentation map of flat field file (int).   \end{itemize}  \subsubsection{Output}  dome.fits_segments.npy contains a list (length the number of segments) of dictionaries. Each dictionary contains information about the location of each segment.  \begin{itemize}  \item ok (boolean) -- The segment has more than 50 illuminated pixels  \item means ([float]) -- The mean Y location of each pixel in the trace. It's length is usually between 200 to 270 pixels long.  \item xs ([float]) -- The X location of each pixel. It's length is the same as means. The ridgeline of the trace is constructed from the points in (xs, means).  \item trace_sigma (float) -- The 1 $\sigma$ width of the trace. An in focus image should have a FWHM of about 2.5 pixels and thus sigma should be about 1.06.  \item poly ([float]) -- A list of polynomial coefficients of order len(poly)-1 that is the best fit line to (xs, means). The bulk of this step's work is to derive poly.  \end{itemize}