MSDP (Hα) between 08:52 -09:02 UT (left column) and between 07:48-0758 UT (right column); (from top to bottom) Hα in the line center, HMI corresponding magnetic field saturated at +/−50 G, Dopplershifts in Hα +/−0.27 Å, Hα in the wing (+/−0.41 Å). The size of the images is 320 × 160 arcsec. Letters A, B1, and B2 indicate different parts of F1. Letters C and D point the feet of the filament shown in F2 (Fig. 1). North makes an angle of 10 degrees with the vertical.