(a) Amplitude of the transfer mobility between the resonator (point C) and the collector (point L) |V _{L z} /F _{C x} | versus frequency and whisker length L _w ; (b) Transfer mobility for the specific whisker’s length L _w  = 1.26 m in magenta and L _w  = 1.20 m in blue as a function of the frequency, these lengths are indicated by dashed vertical lines in (a); (c) Transfer mobility amplitude as a function of whisker length at a specific frequency H5.