# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0166282        0.00435772    
     0.460000          0.700000         0.0212227        0.00266090    
     0.700000           1.00000         0.0112242        0.00520416    
      1.00000           1.54000         0.0213060        0.00240590    
      1.54000           2.40000         0.0175305        0.00253722    
      2.40000           4.80000         0.0135961        0.00330615    
      4.80000           10.0000         0.0113875        0.00544966