The PS matrix 603 and {HEAD ~ PMMA spots} 605 are registered at {TAIL ~ the substrate}; spheres 609 are not 
The PS matrix 603 and { HEAD ~ PMMA spots } 605 are registered at { TAIL ~ the substrate } ; spheres 609 are not
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH