Ratio     if   Frequency, Hz ip   Slowness, s/m ip Record 1/4-Wave Depth, m Avg. Shear Velocity, m/s
    1.0263   11        1.0742   13       0.00144  0      0       162                 694
     1.032   16        1.5625   13       0.00144  0      0       111                 694
    1.0268   24       2.34375   20       0.00222  0      0        48                 450
    1.1134   40       3.90625   22       0.00244  0      0        26                 410
    1.0979   59        5.7617   27       0.00299  0      0        15                 334
    1.1285   64          6.25   28       0.00311  0      0        13                 322