I'm confused by all the terminology being flung around .... but shouldn't you be defining ball spin using D-plane concepts rather than trying to interpret TrackMan result data ... as Ringer has done above ...??
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Addition Edit:
Here's a thought for all you D-planers .... If the clubface 'normal' vector and the clubhead velocity path vector are vertically coincident, then the ball will spin happily with no axis tilt directly to the target. IOW, you can draw the triangular D-plane all the way to the target.
However, if the D-plane is tilted because the 'normal' vector and velocity path vector don't coincide vertically, the D-plane tilts and the spin axis also tilts over in that direction. Then the aerodynamic lift vector takes hold and causes the ball to curve.
In the first example I gave, everything coincided vertically and the ball spin axis was 90º perpendicular to the vertical D-plane .... but ... once you tilt the D-plane and the two vectors are not vertically coincident, then you introduce axis tilt with a spin and the ball curves.
Interestingly, the D-plane only exists to the target if everything coincides vertically ... whether it's straight to the target or a straight push or straight pull shot and the ball spin axis stays perpendicular to the plane (or horizontal to the ground). The ball stays on the D-plane for this case.
If the D-plane vectors diverge and are not coincident and causing an axis tilt, theoretically, the ball immediately starts to curve away from the D-plane. IOW, the D-plane only becomes a benchmark and the ball diverges away from the plane. The spinning tilted axis ball cannot cut across the D-plane. The D-plane only defines the starting point at Impact where the clubface 'normal' and the clubhead path vector are resolved into the initial ball path.
The D-plane is still quite a nebulous concept to most because it requires an appreciation of resolution of vectors. I hope my explanation doesn't further confuse ... but now it is even more clear to me. Now I have to find a TrackMan to see how it captures and represent the data for a spinning ball on a tilted axis.