calculate a block size ratio by dividing {HEAD ~ a number} of {TAIL ~ block size correlation coefficients} above a first threshold by a total number of block size correlation coefficients 
of
calculate a block size ratio by dividing { HEAD ~ a number } of { TAIL ~ block size correlation coefficients } above a first threshold by a total number of block size correlation coefficients
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH