# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.114836        0.00256411    
     0.460000          0.700000          0.136718        0.00245677    
     0.700000           1.00000          0.162486        0.00316529    
      1.00000           1.54000          0.224235        0.00452735    
      1.54000           2.40000          0.348752        0.00933836    
      2.40000           4.80000          0.308339         0.0235351    
      4.80000           10.0000          0.534083         0.0790648