Panel a: vector magnetic field configuration of a part of AR NOAA 12736 where the jet is initiated. Panel b: LOS magnetic configuration at the AR including the two bipoles P1-N2, JP1-JP2. The FOV of panels a and b is presented as the red square in Fig. 1e. Panels c–f: zoomed view of vector magnetic field configuration and panels g–j: zoom view of LOS magnetic field configuration at the small bipole location, where the magnetic flux cancellation occurs. The detached negative (black) polarity is moving towards the south and is shown with white arrows. The FOV of these panels is shown as the white square in panel b. On the left the colour bar indicates the vertical magnetic field strength and the arrow shows the strength of the horizontal magnetic field in the map (panel a and panels c–f).