Origin properties

fig. a: pigtail origin
The pigtail origin is the point at which the pigtail originates from the head. This section describes properties related to the origin:
- the location of the origin (defined by elevation and frontality)
- the amount of hair held together by the pigtail (bundled fraction)
- the 'sagginess' of the pigtail (droop)
- properties of the pigtail holder