Mean reduced velocity U vs. magnitude m5007 of PNe in the matched catalogue. Top: northern (blue squares) and southern (red diamonds) quadrants. Bottom: western (purple squares) and eastern (green diamonds) quadrants. In both panels, the black open symbols denote the entire sample and the respective colour bands the 1σ-error on the reduced velocity. The insets highlight the respective quadrants on the sky, with M49’s photometric major axis denoted by a dashed line. The excess of bright PNe with positive reduced velocity in the northern and southern quadrants motivates the division into a bright and a faint PN sample.
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