Total power or full-disk map in ALMA Band 3 (top row from left to right). Small black dashed square delimits the region showed in SDO/HMI and SDO/AIA 1700-171 and the small black circle depicts the ALMA Band 3 interferometric FoV, SDO/HMI image showing the presence of magnetic field in the ALMA FoV indicated by the red circle, SDO/AIA 170-17.1 nm composite image of the same region, ALMA Band 3 image in which the green dots indicate the median location of all analysed feature and the white circle shows the ALMA Band 6 FoV. Bottom row: same as in the top row but for Band 6, in the ALMA Band 6 image, the small white square with the blue cross in the centre signalise the location of the example feature used in this paper. The small black ellipse in the bottom-left corner of ALMA images show their respective beam shapes.