Go to any page with a graph. Press Download as PDF and open the file.
Instead of the graph image, the pdf contains text like this:
```
//<![CDATA[ if(!window.mw){document.write("\u003Cimg
src=\"//graphoid.wikimedia.org/www.mediawiki.org/
v1/png/Extension%3AGraph%2FDemo%2FMap/
0/3cbe2b968108670c001e230dca4682a9d03f8814.
png\char"005C\relax{}" /\u003E”);} //]]> <p><img
src="//graphoid.wikimedia.org/www.mediawiki.org/
v1/png/Extension%3AGraph%2FDemo%2FMap/0/
3cbe2b968108670c001e230dca4682a9d03f8814.png"
/></p>
```
[[ https://www.mediawiki.org/w/index.php?title=Special:Book&bookcmd=download&collection_id=89b0d5ee4e6e95e594bcddacf3727ff3257b11ad&writer=rdf2latex&return_to=Extension%3AGraph%2FDemo%2FMap | Map Demo ]]
[[ https://el.wikipedia.org/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%A3%CF%85%CE%BB%CE%BB%CE%BF%CE%B3%CE%AE&bookcmd=download&collection_id=5dbd309393f8fca40ec87d2b71dcce4af0ae8fc0&writer=rdf2latex&return_to=%CE%A7%CF%81%CE%AE%CF%83%CF%84%CE%B7%CF%82%3AGeraki%2F%CF%80%CF%81%CF%8C%CF%87%CE%B5%CE%B9%CF%81%CE%BF | Many graphs ]]