# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.175270        0.00161915    
     0.460000          0.700000          0.189262        0.00170707    
     0.700000           1.00000          0.187957        0.00212312    
      1.00000           1.54000          0.188658        0.00246693    
      1.54000           2.40000          0.182068        0.00338206    
      2.40000           4.80000          0.163241        0.00480566    
      4.80000           10.0000          0.168896        0.00798331