linear.tex

\documentclass{standalone}
\usepackage{pgfplots}
\usepackage{pgfplotstable}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
\begin{axis}[ /pgf/number format/.cd,  y tick label style={/pgf/number format/.cd,%
          scaled y ticks = false,
          set thousands separator={},
          fixed}, xlabel={Resonant Magnetic Field [mTesla]}, ylabel={Resonant Frequency [kHz]}]

\addplot[mark size=0.5, only marks,
      error bars/.cd,
        y dir=both, y explicit,
        x dir=both, x explicit
      ]
   table [x error index=3, y error index=4]
   {data_glycerin.txt};
   \addplot[mark size = 0.5, only marks,color=black]
    table [x index = 0, y index= 1]
    {data_glycerin.txt}; 
    \addplot[no markers,color=blue]
    table [x index = 0, y index= 2]
    {data_glycerin.txt}; 
       \addlegendentry{\hspace{-.6cm}$42.9(6)B_{0}-$}

\end{axis}
\end{tikzpicture}

\end{document}