From left to right: flow maps of the continuum, COG longitudinal field and LOS-velocity of the ℓ10 emergence. Background images are average images of the following quantities: average normalized continuum image; longitudinal magnetic field, clipped to  ± 50 G; and LOS-velocity (kms^-1 ). The full FOV is . Separation length between tickmarks is equivalent to a velocity magnitude of 1.5 kms^-1. A circle of diameter 83 (same as in Fig. 2) is overplotted for comparison. See text for more details.