Three dice, possibly different (e.g. 1d4, 1d6 and 1d8), are thrown and only the best result is kept (system used in the Usagi Yojimbo roleplaying game). The top figure shows the probability to get a value. The bottom figure shows the probability to have a result equal or better than a value.
<a href="//commons.wikimedia.org/wiki/User:MHz%60as" title="User:MHz`as">MHz`as</a>
<span class="int-own-work" lang="en">Own work</span>, from the original raster <a href="//commons.wikimedia.org/wiki/File:1d_choisi_parmi_3_differents.png" title="File:1d choisi parmi 3 differents.png">File:1d choisi parmi 3 differents.png</a> by Christophe Dang Ngoc Chan (<a href="//commons.wikimedia.org/wiki/User:Cdang" title="User:Cdang">Cdang</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Cdang" title="User talk:Cdang"><span class="signature-talk">talk</span></a>))