Cartoon of the possible scenarios underlying Class I cancelation events. Panel a: emergence followed by flux retraction. Panel b: emergence, then reconnection followed by submergence. The bold dashed rectangle represents a part of the solar surface. N and P indicate negative and positive magnetic polarity. The solid and dotted ovals represent the newly emerged bipole. The red line represents the boundary of the pre-existing large magnetic feature. Solid black lines are parts of field lines above the solar surface, dashed lines are parts below it. Blue and red arrows indicate up- and downflows.