Use the labelmap tools in the normal way. Note preview is turned off for those
tools to simplify initial segment creation.
<br>Segments are interpolated BETWEEN slices, so you need to create two or more
segments of the same segment index on slices in a viewport separated by at least
one empty segment.</b>
Use "Extended Interpolation" button to interpolate segments which don't
overlap (assuming the segments were drawn on the same slice).
Use "Overlapping Interpolation" button to interpolate overlapping segments - that is, the segment must
overlap if drawn on the same slice to interpolate between them. This is a good choice
for multiple segments.
Accept the interpolation by hitting enter, or use the "Reject Preview/Interpolation" button.