# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.157332         0.0106191    
     0.460000          0.700000          0.176898        0.00617003    
     0.700000           1.00000          0.193229        0.00714077    
      1.00000           1.54000          0.247734         0.0112937    
      1.54000           2.40000          0.244040         0.0191078    
      2.40000           4.80000          0.265499         0.0268692    
      4.80000           10.0000          0.152757         0.0810645