# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0467359        0.00386013    
     0.460000          0.700000         0.0502355        0.00405633    
     0.700000           1.00000         0.0598173        0.00533491    
      1.00000           1.54000         0.0868631        0.00481853    
      1.54000           2.40000         0.0850893        0.00647248    
      2.40000           4.80000         0.0735555        0.00692520    
      4.80000           10.0000         0.0617457         0.0135935