# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0204415        0.00290895    
     0.460000          0.700000         0.0223865        0.00246567    
     0.700000           1.00000         0.0135418        0.00299506    
      1.00000           1.54000         0.0204136        0.00262795    
      1.54000           2.40000         0.0159542        0.00318782    
      2.40000           4.80000         0.0238242        0.00351520    
      4.80000           10.0000         0.0117725        0.00486400