# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.147183        0.00393076    
     0.460000          0.700000          0.139739        0.00315607    
     0.700000           1.00000          0.125620        0.00355422    
      1.00000           1.54000          0.124930        0.00307700    
      1.54000           2.40000          0.114090        0.00298284    
      2.40000           4.80000          0.104795        0.00278321    
      4.80000           10.0000         0.0938094        0.00354211