# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0926628        0.00144675    
     0.460000          0.700000         0.0988032        0.00138319    
     0.700000           1.00000          0.102519        0.00159596    
      1.00000           1.54000          0.109282        0.00209939    
      1.54000           2.40000          0.117259        0.00297392    
      2.40000           4.80000          0.123506        0.00384493    
      4.80000           10.0000          0.130898        0.00707016