A map of cantons of Luxembourg colour-coded by population density.  Population density is denoted by six different shades of red; in order of increasingly darker shades, the lower bounds (in people/km²) are: 0, 80, 120, 170, 220, 270, 1000.
<a href="//commons.wikimedia.org/w/index.php?title=User:Apelschnaps/Signature&amp;action=edit&amp;redlink=1" class="new" title="User:Apelschnaps/Signature (page does not exist)">Apelschnaps</a>
Own work based on <a href="//commons.wikimedia.org/wiki/File:Groothertogdom_LuxemburgKantons.png" title="File:Groothertogdom LuxemburgKantons.png">Image:Groothertogdom LuxemburgKantons.png</a>.