Where is the system tray icon stored?

I want to edit the system tray icon to match the others, but I’m having some difficulty finding where it’s stored. Has anyone else done this before, or know where it’s located?

EDIT: I’m running Ubuntu Linux by the way.

It should be in the AppImage file so I guess you could unpack the icon from it, change it, and pack it back inside.

It should be in a directory called icons/16x16.png