*Redundant information in SWC files*

Every point in an SWC file has a TypeID. This is often redundant, 
because in a tree, all points have the same type. HMV only uses the
TypeID of the first point in a segment, all other TypeIDs are ignored. 
A segment is defined as a connected set of points where only the last 
point may have multiple children (i.e. be a branch point).

In some variants of SWC, branch points and end points of a tree are 
explicitly labeled as separate structures. HMV ignores these labels, 
but since it detects branch points automatically based on the number of 
child segments, it is still compatible with said variants of SWC.

Because branch points and end points are not structures, and can be
automatically detected by counting the number of children of a point,
SWC+ internally replaces structures 5 and 6 by the StructureID of the
point's parent.
</p><p>

 that have certain
quirks that do not fit the SCW specification. It can import SWC files 
with SampleIDs in any order. Other software may require positive 
increasing integer indices, and therefore the HMV exports SampleIDs with 
increasing integer indices starting at 1. The HMV can import SWC files 
with parents defined later in 
the file. Other software may require parents to be defined before any 
children, and this is how HMV exports SWC files.