The spectrum is measured over a time period of 1 to 1000 seconds, at {HEAD ~ intervals} of {TAIL ~ 5 to 10 milliseconds} or less 
of
The spectrum is measured over a time period of 1 to 1000 seconds , at { HEAD ~ intervals } of { TAIL ~ 5 to 10 milliseconds } or less
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH