# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0313673         0.0125765    
     0.700000           1.00000         0.0515959         0.0209981    
      1.00000           1.54000         0.0285057         0.0270761    
      1.54000           2.40000         0.0260365         0.0430979    
      2.40000           4.80000         0.0571190         0.0248483    
      4.80000           10.0000        0.00519403         0.0497267