C.<p><span class="h-card" translate="no"><a href="https://mstdn.social/@peterdrake" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>peterdrake</span></a></span> <span class="h-card" translate="no"><a href="https://social.mkj.earth/@mkj" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>mkj</span></a></span> <span class="h-card" translate="no"><a href="https://mathstodon.xyz/@jitseniesen" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>jitseniesen</span></a></span> <span class="h-card" translate="no"><a href="https://oldbytes.space/@apa" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@<span>apa</span></a></span> </p><p>Well, I confirmed that the bizarro text at the top of the Y axis is not in fact part of the Y axis. If you set the style of the Y axis tick labels to plain, so it doesn't use scientific notation:</p><p>>>> plt.ticklabel_format(axis="y", style="plain")</p><p>... that one bizarro value is still shown in scientific format.</p><p>I don't recall if matplotlib supports multiple scales/sets of ticks on an axis, so I'm not sure where that value is coming from. I looked at the data generated by your code and didn't see anything weird.</p><p>I think you need either a matplotlib expert, or a user discussion group. Or at least someone who's used matplotlib more recently than the Clinton administration... 😉 </p><p><a href="https://mindly.social/tags/matplotlib" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>matplotlib</span></a> <a href="https://mindly.social/tags/Python" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Python</span></a> <a href="https://mindly.social/tags/plot" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>plot</span></a> <a href="https://mindly.social/tags/graph" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>graph</span></a> <a href="https://mindly.social/tags/weird" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>weird</span></a> <a href="https://mindly.social/tags/wat" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>wat</span></a></p>