# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.206373        0.00147028    
     0.460000          0.700000          0.214791        0.00149074    
     0.700000           1.00000          0.216419        0.00174175    
      1.00000           1.54000          0.224274        0.00203506    
      1.54000           2.40000          0.221288        0.00286026    
      2.40000           4.80000          0.217733        0.00404486    
      4.80000           10.0000          0.200886        0.00609892