# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0466095        0.00199212    
     0.460000          0.700000         0.0532717        0.00157830    
     0.700000           1.00000         0.0514582        0.00165186    
      1.00000           1.54000         0.0488981        0.00166429    
      1.54000           2.40000         0.0534062        0.00193712    
      2.40000           4.80000         0.0484194        0.00251178    
      4.80000           10.0000         0.0443699        0.00342149