# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.259657        0.00980901    
     0.460000          0.700000          0.293396         0.0103149    
     0.700000           1.00000          0.335723         0.0156953    
      1.00000           1.54000          0.569822         0.0264839    
      1.54000           2.40000          0.758067         0.0443656    
      2.40000           4.80000          0.680878         0.0571832    
      4.80000           10.0000          0.579751         0.0691106