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