||integer value, generally
though this is not required.
Standardized swc files (www.neuromorpho.org) -
'y', 'z' are spatial co-ordinates, given in micrometers.
'radius' is half the dendrite thickness, also given in micrometers (note this is one of the few formats which use radius instead of diameter)
|The sample number.
Connectivity is expressed with this value.
Parent samples should appear before any child samples.