Above-cutoff pixels that contributed to the profile.
Axial positions in the profile, i.e. the region's extent along the axis
minus the leading and trailing all-background runs. Compare it against
the region's own width/height: a tube that is continuous by construction
must give samples === rect.width (or rect.height for 'y').
Positions INSIDE the profile whose cross-section was entirely
background, i.e. holes in the tube. Recorded as 0 in
profile rather than dropped — see the function docs.
Raw (un-normalised) median cross-section sum, in luminance units.
Cross-section sums divided by medianFlux, in axial order.
5th percentile of profile — the joint-dip detector.
95th percentile of profile.
Smallest value of profile.
Outcome of measureAxialFlux.