# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0197965        0.00834174    
     0.700000           1.00000         0.0381632         0.0114787    
      1.00000           1.54000         0.0287852        0.00709255    
      1.54000           2.40000         0.0474256        0.00611688    
      2.40000           4.80000         0.0258056        0.00529818    
      4.80000           10.0000         0.0222414        0.00669048