Each point sample contains {TAIL ~ 3D coordinates} in a 3D coordinate system, as well as {HEAD ~ colour and intensity information} 
Each point sample contains { TAIL ~ 3D coordinates } in a 3D coordinate system , as well as { HEAD ~ colour and intensity information }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD