{HEAD ~ The mixture} comprises a precursor of a desired material within a supercritical fluid, and is initially provided in the chamber under {TAIL ~ first conditions} at which the precursor is stable 
is initially provided under
{ HEAD ~ The mixture } comprises a precursor of a desired material within a supercritical fluid , and is initially provided in the chamber under { TAIL ~ first conditions } at which the precursor is stable
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH