The list of frequencies for the resonance and antiresonance modes, as well as electromechanical coupling factors, is shown below.
Note that the first 6 modes clearly correspond to rigid body modes. Then, in the above figure, we have highlighted one mode (at 71.15kHz) which displays a high electromechanical coupling co-efficient (22.3%). This mode is most likely the λ/2 longitudinal mode.
Note that the frequency list is available in a comma separated value (CSV) format in the problem directory (use ATILA | Open Shell to directly access it).

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