# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.383475         0.0196975    
     0.460000          0.700000          0.394134         0.0161274    
     0.700000           1.00000          0.196060         0.0242604    
      1.00000           1.54000          0.154532         0.0345430    
      1.54000           2.40000          0.399766         0.0553696    
      2.40000           4.80000          0.475834         0.0483714    
      4.80000           10.0000          0.407077         0.0669535