# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0104628        0.00578647    
     0.460000          0.700000        0.00767645        0.00613455    
     0.700000           1.00000         0.0145217        0.00637872    
      1.00000           4.80000        0.00658615        0.00423505    
      4.80000           10.0000         0.0179568        0.00969455