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