The desired residence time within the cracking chamber, which is {HEAD ~ the time} available for photolysis should be in {TAIL ~ the range} of a few milliseconds to several hundred milliseconds 
The desired residence time within the cracking chamber , which is { HEAD ~ the time } available for photolysis should be in { TAIL ~ the range } of a few milliseconds to several hundred milliseconds
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH