deletions | additions       diff --git a/User Models and Templates.tex b/User Models and Templates.tex  index e91cdd7..a41676a 100644  --- a/User Models and Templates.tex  +++ b/User Models and Templates.tex 
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\subsection{Custom Python Functions}  Iris accepts custom models written as Python functions saved in *.py files. Any number of functions can be written in the file. The function must take two parameters: the first is an iterable of the model parameters, the second is a placeholder for the spectral axis, $x$. One caveat is that the spectral data $x$ must be in terms of Angstroms. For example, a model file for a modified black body  \(B_{\nu}(T) \left(\frac{\nu}{\nu_{0}}\right)^{\beta}\)  could be defined as in \textbf{code snipet} \ref{sec:user_model_example}. \ref{lst:user_model_example}.  User models can be arbitrarily combined with other custom or preset model functions. \subsection{Table Models}  A table model is a single template, having just the $x$ and $y$ coordiantes. Iris accepts two-columned ASCII files as table models, following the convention where the first column is the spectral values (in Angstroms) and the second contains the fluxes (in $\mathrm{photons}/\mathrm{s}/\mathrm{cm}^{2}/\AA$). The fit returns the normalization constant (or amplitude) of the model.