# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0197955        0.00328079    
     0.460000          0.700000        0.00787472        0.00350836    
     0.700000           1.00000         0.0165294        0.00402532    
      1.00000           1.54000         0.0162818        0.00442596    
      1.54000           2.40000         0.0125423        0.00589256    
      2.40000           4.80000        0.00618992        0.00866628    
      4.80000           10.0000        0.00907625         0.0103852