Overview of NLFFF extrapolation results and comparison with observations reprojected to the CEA coordinate frame of the extrapolation. (a) HMI B_r magnetogram. The contours show the maximum brightness of flare ribbons in a series of AIA 1600 Å images between 20:00 and 20:45 UT. The contour levels are 25, 100, and 400 DN/s. (b) 5000 field lines randomly started from the lower boundary of the extrapolation volume with the HMI LOS magnetogram and AIA 1600 Å contours as background. The field lines are color-coded according to the local current density. Regions of low current density are made increasingly transparent to keep the underlying high current density filament channel visible. (c) Same as b, but with 50 000 field lines. (d) 5000 field lines with the AIA 211 Å image showing the dimming as a background. The dimming area is marked by a cyan mask. (e and f) reprojected KSO Hα and AIA 211 Å images for reference. The locations of the PIL (green dotted) and inverse J-shaped flare ribbon (white dashed) are indicated on some panels. The movie accompanying this figure shows a smooth transition between the NLFFF extrapolation and the AIA 304 Å and KSO Hα images. The movie is available online.