# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.158996        0.00315711    
     0.460000          0.700000          0.180084        0.00332689    
     0.700000           1.00000          0.175938        0.00431972    
      1.00000           1.54000          0.181019        0.00405138    
      1.54000           2.40000          0.173518        0.00531050    
      2.40000           4.80000          0.144543        0.00554237    
      4.80000           10.0000          0.119994        0.00915169