# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.252945        0.00190742    
     0.460000          0.700000          0.269534        0.00167373    
     0.700000           1.00000          0.297714        0.00210965    
      1.00000           1.54000          0.308539        0.00197933    
      1.54000           2.40000          0.291043        0.00218604    
      2.40000           4.80000          0.237811        0.00252178    
      4.80000           10.0000          0.179184        0.00372765