{HEAD ~ The rapid solvent exchange process} is followed by {TAIL ~ depressurization}, optionally with a gas exchange 
is followed by
{ HEAD ~ The rapid solvent exchange process } is followed by { TAIL ~ depressurization } , optionally with a gas exchange
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH