# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.250541         0.0124372    
     0.460000          0.700000          0.243861         0.0128362    
     0.700000           1.00000          0.204529         0.0192823    
      1.00000           1.54000          0.233321         0.0212152    
      1.54000           2.40000          0.285665         0.0218945    
      2.40000           4.80000         0.0777032         0.0352554    
      4.80000           10.0000         0.0265228         0.0746578