{HEAD ~ Appropriate ranges} can be derived from {TAIL ~ special data material}, and in the case of the examples discussed, values in the range of 5 to 20 are typically obtained 
derived from
{ HEAD ~ Appropriate ranges } can be derived from { TAIL ~ special data material } , and in the case of the examples discussed , values in the range of 5 to 20 are typically obtained
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH