# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.244952         0.0285579    
     0.460000          0.700000          0.373658         0.0141672    
     0.700000           1.00000          0.395735        0.00702030    
      1.00000           1.54000          0.367222        0.00365775    
      1.54000           2.40000          0.329833        0.00317432    
      2.40000           4.80000          0.280406        0.00337217    
      4.80000           10.0000          0.227139        0.00443723