All given in Hz.
**********************************
f_6Harm_VM =
          2842.214
           2843.14
          2843.585
          2844.931
          2849.271
          2850.640
           2854.883
          2856.312
          2857.372
          2858.198
          2858.533
          2858.846
          2860.332
          2860.589
          2861.148
          2861.786
          2866.687
          2867.296
          2868.482
          2869.672
          2876.326
          2877.974
           2882.159
          2882.232
          2883.951
          2885.572
          2889.977
          2891.124
          2892.361
          2893.727
           2894.609
          2896.006
          
**********************************
  diff(f_6Harm_VM)
      0.92611
      0.44552
       1.3458
       4.3395
       1.3696
       4.2429
       1.4282
       1.0605
      0.82633
      0.33507
      0.31276
       1.4861
      0.25707
      0.55893
      0.63732
        4.901
       0.6094
       1.1856
       1.1909
       6.6533
       1.6484
       4.1851
     0.073272
        1.718
       1.6211
        4.405
       1.1474
       1.2369
       1.3662
      0.88145
        1.397
    
**********************************
max(f_6Harm_VM) - min(f_6Harm_VM)
 53.792