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