# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.375587        0.00442724    
     0.460000          0.700000          0.380716        0.00498846    
     0.700000           1.00000          0.316892        0.00557042    
      1.00000           1.54000          0.319867        0.00662091    
      1.54000           2.40000          0.326133        0.00756794    
      2.40000           4.80000          0.258105        0.00847973    
      4.80000           10.0000          0.176338         0.0110575