# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0263506         0.0188567    
     0.460000          0.700000         0.0197068         0.0132606    
     0.700000           2.40000         0.0243289        0.00682234    
      2.40000           4.80000         0.0959180         0.0236636    
      4.80000           10.0000          0.122048         0.0140578