# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0535792        0.00699083    
     0.460000          0.700000         0.0427344        0.00701226    
     0.700000           1.00000         0.0357906         0.0130371    
      1.00000           1.54000         0.0632342         0.0101986    
      1.54000           2.40000         0.0553151         0.0133053    
      2.40000           4.80000         0.0512633         0.0174584    
      4.80000           10.0000         0.0433083         0.0352926