{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "\n# Span Selector\n\nThe `.SpanSelector` is a mouse widget that enables selecting a range on an\naxis.\n\nHere, an x-range can be selected on the upper axis; a detailed view of the\nselected range is then plotted on the lower axis.\n\n
If the SpanSelector object is garbage collected you will lose the\n interactivity. You must keep a hard reference to it to prevent this.