The assembly 1, wherein {HEAD ~ the desired average fly height} is lower than {TAIL ~ the unaltered average fly height} 
is lower than
The assembly 1 , wherein { HEAD ~ the desired average fly height } is lower than { TAIL ~ the unaltered average fly height }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL