Top row: frame sequence of AIA 304 Å images of a filament’s barb (darker areas) with LOS-magnetic field superimposed. Different shades of green (from lighter to darker) contours mark different levels, as 90, 200, 500, 600, and 700 G, while a gamut of blue contours mark –90, –200, –500, –700, –900 G for the negative polarities. The frame size is 100′′× 100′′. Sequence timing aims to show the magnetic flux emergence (panel 1), pre-flare (panel 2), flare (panel 3), and decay (panel 4), from left to right. Bottom row: same temporal sequence in AIA 211 and 94 Å. An associated movie is available online.