# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.373850        0.00360727    
     0.460000          0.700000          0.381512        0.00332713    
     0.700000           1.00000          0.415867        0.00464935    
      1.00000           1.54000          0.407280        0.00472702    
      1.54000           2.40000          0.361255        0.00525096    
      2.40000           4.80000          0.276903        0.00612850    
      4.80000           10.0000          0.189256        0.00744660