Magnetic field model of AR 12960 on 7 March overlaid on an AIA 171 Å image with the intensity reversed. The axes in the panel are labelled in Megametres, with the origin set in the active region centre. The isocontours of the LOS field correspond to ±30, ±100, and ±800 G outlined in magenta (cyan) style for the positive (negative) values. Sets of computed field lines matching the global shape of the observed coronal loops are indicated with black lines.