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