Reconnection and magnetic flux pile-up. Left column: vertical magnetic field map around the reconnection region. Green boxes identify the averaging regions. Middle and right columns: average vertical magnetic field and the horizontal inflow into the current sheet dependences on the distance from the current sheet, respectively. The first three rows demonstrate the magnetic flux pile-up at the scale predicted by the pile-up reconnection model. The fourth row shows stronger reconnecting magnetic fields and does not show the localised enhancements of the vertical magnetic field in proximity of the current sheet.