{HEAD ~ The apparatus} 1, further comprising {TAIL ~ an amplitude detector} that detects an amplitude of the torsional motion of the cantilever 
comprising
{ HEAD ~ The apparatus } 1 , further comprising { TAIL ~ an amplitude detector } that detects an amplitude of the torsional motion of the cantilever
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH