https://youtu.be/SUmml9elLP0?t=164 (starting at 2:44)
shows adding slashes for the _RibbonOffset’s Sweep 2 option to achieve a common desired isocurve pattern when one is using this command.
Due to the relationship of the starting and offset curves, the slash pattern is where, per CPlane projection, the lines connecting the closest point distances between the 2 curves are also perpendicular to both curves.
It would be great if this pattern was automatically created, at least as an option.