If the modification times remain different, then {HEAD ~ the remote file system} is used to read {TAIL ~ the file} 
If the modification times remain different , then { HEAD ~ the remote file system } is used to read { TAIL ~ the file }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL