FIGS 6 and 7 are {HEAD ~ spectrums} of the flexural and torsional vibrations, respectively, of cantilever 120 tapping on {TAIL ~ a sample surface} at the fundamental flexural resonance frequency 
FIGS 6 and 7 are { HEAD ~ spectrums } of the flexural and torsional vibrations , respectively , of cantilever 120 tapping on { TAIL ~ a sample surface } at the fundamental flexural resonance frequency
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH