# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00955624        0.00533625    
      1.00000           1.54000         0.0340904        0.00325384    
      1.54000           2.40000         0.0188805        0.00168809    
      2.40000           4.80000         0.0312197        0.00124971    
      4.80000           10.0000         0.0243129        0.00153362