"IEC 1/1-Oct Mag - dB SPL "
      "Hz"      "Data"
        16,   8.243182
      31.5,   15.62435
        63,   27.47962
       125,   36.26886
       250,   38.47678
       500,   42.69476
      1000,   46.93066
      2000,   51.72777
      4000,   49.90021
      8000,   51.14788
     16000,   54.17632