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/usr/lib/python3/dist-packages/matplotlib/backends/web_backend/mpl_tornado.js is in python3-matplotlib 1.5.1-1ubuntu1.

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/* This .js file contains functions for matplotlib's built-in
   tornado-based server, that are not relevant when embedding WebAgg
   in another web application. */

function mpl_ondownload(figure, format) {
    window.open(figure.id + '/download.' + format, '_blank');
}