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Table 2

Initial orientations of the internal spins of the primary (p) and secondary (s) progenitors.

ID codea direction of Jp direction of Js
DX90 ĵ
DY90 +î
RX90 ĵ
RY90 +î
X90X90 ĵ ĵ
X90X270 ĵ +ĵ
Y90Y90 +î +î
Y90Y270 +î î
X90Y90 ĵ +î



D stands for “Direct”, i.e. parallel to the orbital spin, which in all cases is oriented along the Z+ axis; R for “Retrograde”, i.e. anti-parallel to the orbital spin, X90 means that the galaxy is rotated 90° counterclockwise around the X axis, Y90 represents a positive rotation of 90° around the Y axis, etc.

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