# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0678990        0.00440816    
     0.460000          0.700000         0.0687097        0.00359362    
     0.700000           1.00000         0.0693628        0.00434861    
      1.00000           1.54000         0.0568838        0.00332144    
      1.54000           2.40000         0.0555687        0.00349115    
      2.40000           4.80000         0.0497102        0.00367487    
      4.80000           10.0000         0.0354044        0.00427759