ECG complex (labelled in Esperanto)
<a href="//commons.wikimedia.org/wiki/User:ThomasPusch" title="User:ThomasPusch">ThomasPusch</a>. Originally created by <a href="https://de.wikipedia.org/wiki/User:Hank_van_Helvete" class="extiw" title="de:User:Hank van Helvete">Hank van Helvete</a> from German Wikipedia.
CC BY-SA 4.0
Own work. Based on <a class="external autonumber" href="https://de.wikipedia.org/wiki/Bild:EKG_Komplex.svg">[1]</a>