a) MDI/SOHO magnetograms for AR NOAA 9077; the magnetic field strength on the isolines is shown in gausses. b) Model magnetograms for the same AR with the same isolines: n1 and n2 are the north-polarity sources; s1, s2, and s3 are the south-polarity sources, and X1, X2, and X3 are the null points. c) Separator X1X3 (SEP, dashed black line), magnetic field lines in its vicinity (MFL, black lines), and flare ribbons (FR).
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