% vim:ts=2 sw=2 et:
\documentclass[tikz, border=5mm]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
  \begin{axis}[
      clip = false,
      width = 8cm, height = 6cm,
      xtick = \empty, ytick = \empty,
      colormap name = viridis,
      axis lines = middle,
      axis line style = {ultra thick, -latex}
    ]
    \addplot+[
      smooth, mark=none, line width = 3pt, mesh,
      point meta=explicit,
    ] file {curvature-1d.dat};
  \end{axis}
\end{tikzpicture}
\end{document}