# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00497669        0.00694932    
     0.460000          0.700000         0.0155872        0.00457208    
     0.700000           1.00000        0.00589631        0.00748199    
      1.00000           4.80000        0.00373827        0.00498798    
      4.80000           10.0000         0.0106354         0.0110821