# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.357373        0.00450714    
     0.460000          0.700000          0.359365        0.00420122    
     0.700000           1.00000          0.387668        0.00525645    
      1.00000           1.54000          0.480457        0.00713731    
      1.54000           2.40000          0.484395         0.0114331    
      2.40000           4.80000          0.464797         0.0173266    
      4.80000           10.0000          0.405779         0.0343600