In FIG 4C, the SRRs #3 and {HEAD ~ #}5 in the opened session #2 are opened SRRs and the SRR #4 is {TAIL ~ a closed SRR} 
In FIG 4C , the SRRs # 3 and { HEAD ~ # } 5 in the opened session # 2 are opened SRRs and the SRR # 4 is { TAIL ~ a closed SRR }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL