cross_section.tex

\documentclass{standalone}

\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.15}

\begin{document}
\begin{tikzpicture}
%\begin{semilogyaxis} [
\begin{axis} [
    xmin = 1.8,
    xmax = 4,
    % %ymin = 0,
    restrict y to domain=0:5,
    xlabel=$\mathrm{E_{\nu} \left\lbrack MeV \right\rbrack}$, 
    ylabel=$\sigma \left\lbrack 10^{-42} \mathrm{cm}^2 \right\rbrack$, 
    legend pos=south east,
]
    \addplot [
        smooth, 
        very thin, 
        black,
    ] table [header=false, y expr=\thisrowno{1}*1e+4] {cs_cvc.txt}
    ;
    \addlegendentry{CVC}
    \addplot [
        smooth, 
        thin, 
        blue,
        very thin, 
    ] table [header=false, y expr=\thisrowno{1}*1e+4] {cs_no_cvc.txt}
    ;
    \addlegendentry{No CVC}
\end{axis}
%\end{semilogyaxis} [
\end{tikzpicture}
\end{document}