All given in Hz.
**********************************
f_7Harm_VM =
          3267.803
          3268.876
          3281.745
          3283.043
          3283.586
          3283.723
          3283.751
          3284.312
          3284.352
          3285.272
          3290.598
          3292.341
          3297.45
          3298.49
          3299.998
          3320.808
          3322.215
           3328.069
          3328.481
          3336.228
          3336.432
          3338.606
          3339.955
          3340.621
          3341.722
          3348.488
          3349.957
          3361.71
          3363.390
          3366.172
          3369.315
          3374.989
          
**********************************
  diff(f_7Harm_VM)
       1.0729
        12.87
       1.2972
      0.54302
       0.1372
     0.028584
      0.56029
     0.040025
       0.9207
       5.3257
       1.7433
       5.1083
       1.0399
       1.5083
        20.81
        1.407
       5.8542
       0.4121
       7.7473
      0.20397
       2.1735
       1.3491
       0.6659
       1.1012
       6.7657
       1.4695
       11.752
       1.6805
        2.782
       3.1434
        5.674
            
**********************************
max(f_7Harm_VM) - min(f_7Harm_VM)
  107.19