RA and Dec of the PNe (open squares) and the FFs (large open circles, whose radii are proportional to their effective radii) overplotted on a B-band image of the NGC 1023 system. The companion galaxy NGC 1023A is evident on the left side of NGC 1023, as a brighter cloud. The stars over this overdensity indicate the PNe associated to the companion galaxy. Filled squares represent the stream of PNe. The contours represent the H i distribution (see text for details).