# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.205336        0.00852013    
     0.460000          0.700000          0.221019        0.00896533    
     0.700000           1.00000          0.322534         0.0136078    
      1.00000           1.54000          0.554947         0.0229712    
      1.54000           2.40000          0.637619         0.0380355    
      2.40000           4.80000          0.545614         0.0478369    
      4.80000           10.0000          0.408810         0.0553720