Overview of target as seen by SDO and ALMA on 13 April 2019. Clockwise from top left: HMI magnetogram, spectral radiance in AIA 1600 Å and AIA 1700 Å, ALMA 3 mm brightness temperature (capped at 10 kK for display), and spectral radiance in AIA 193 Å and AIA 304 Å. The dotted circle displays the ALMA field of view. The x and y axes are the helioprojective coordinates at approximately 18:20 UTC. The crosses indicate the location of EBs (see Sect. 3.1), and the triangles correspond to NFs (see Sect. 3.2) that we detected in the entire time series.