# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.103906        0.00386335    
     0.460000          0.700000          0.105677        0.00383939    
     0.700000           1.00000          0.105734        0.00483613    
      1.00000           1.54000         0.0878829        0.00585479    
      1.54000           2.40000         0.0897192        0.00717956    
      2.40000           4.80000          0.107580         0.0105664    
      4.80000           10.0000         0.0650392         0.0198866