# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.240924         0.0212318    
     0.460000          0.700000          0.274039         0.0168370    
     0.700000           1.00000         0.0965267         0.0365130    
      1.00000           1.54000         0.0881427         0.0641806    
      1.54000           2.40000          0.301981         0.0738644    
      2.40000           4.80000          0.325442         0.0596928    
      4.80000           10.0000          0.222161          0.110124