How to show the “data-does-not-start-at-zero” symbol on a pgfplot graph?

Question

I have a graph and it doesn't start at zero. How do I add the symbol (my vague description is mentioned in the title) to the y axis of the graph? If it helps, my graph is a scatterplot.

Answer 1

There's the key axis y discontinuity=<crunch|parallel|none> that will insert a symbol on your axis:

\documentclass[tikz,border=2mm]{article}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
\begin{axis}[ymin=370,axis y discontinuity=crunch]
\addplot {rnd*200+400};
\end{axis}
\end{tikzpicture}
\end{document}