Fig. 2
Upper panel: spatial recurrence image obtained by plotting the raw detections as red crosses (cf. Sects. 1, 3), zoomed in on the bulge of M 31. The center of M 31 is marked by the green cross. North is upward and east is left. Due to saturation close to the center of M 31, there are no sources detected by the iPTF pipeline. Lower panel: outer part of the spatial recurrence image, approximately half a degree northward of the center of M 31.
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