Apertures within each segmentation are ordered by minimizing the total leaf movement between {HEAD ~ sets} of aperture shapes corresponding to {TAIL ~ adjacent delivery angles} 
Apertures within each segmentation are ordered by minimizing the total leaf movement between { HEAD ~ sets } of aperture shapes corresponding to { TAIL ~ adjacent delivery angles }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL