Throughout this paper we use the M 31-fixed coordinate system of Baade & Arp (1964): centre coordinates $\rm RA = 0^h40^m 00\hbox{$.\!\!^{\rm s}$ }3,\ Dec = 41\hbox{$^\circ$ }00\hbox{$^\prime$ }03\hbox{$^{\prime\prime}$ }$ (1950.0) (Dressel & Condon 1976), X along the major axis ( $\rm PA= 37\hbox{$.\!\!^\circ$ }7$ ), positive to the NE, Y along the minor axis, positive to the SE. All velocities are in the LSR frame.

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The full results of the position-switched observations will be presented elsewhere.

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... $X,Y = 25\hbox{$.\mkern-4mu^\prime$ }5,\ 3\hbox{$.\mkern-4mu^\prime$ }0$ )

The dark cloud complexes (e.g. D615) are indicated with their appellation in Hodge's Atlas of the Andromeda Galaxy (Hodge 1981a).

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