{HEAD ~ Such a collection} of {TAIL ~ particles} is sometimes referred to as being “monodisperse” 
{ HEAD ~ Such a collection } of { TAIL ~ particles } is sometimes referred to as being “ monodisperse ”
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH