# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.141546        0.00476459    
     0.460000          0.700000          0.135352        0.00466522    
     0.700000           1.00000          0.169323        0.00604295    
      1.00000           1.54000          0.283005        0.00975649    
      1.54000           2.40000          0.326872         0.0160630    
      2.40000           4.80000          0.366194         0.0254201    
      4.80000           10.0000          0.178309         0.0854522