a) Full field-of-view of the ROSA G-band image of AR 11372. b) Corresponding HMI magnetogram. The white boxes in a) and the yellow boxes in b) show the three subfields used in the study which are expanded in c). The numbers in the boxes indicate which boxes in the full field-of-view correspond to their respective expanded views. A colour bar in b) indicates the magnetic flux density (in Gauss), saturated at ±600 G to assist visualisation of the field complexities.