# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.188639        0.00272942    
     0.460000          0.700000          0.184009        0.00251157    
     0.700000           1.00000          0.184593        0.00262084    
      1.00000           1.54000          0.155223        0.00212874    
      1.54000           2.40000          0.134059        0.00246038    
      2.40000           4.80000          0.111467        0.00259806    
      4.80000           10.0000         0.0914501        0.00354095