# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.620009        0.00916511    
     0.460000          0.700000          0.626558        0.00754993    
     0.700000           1.00000          0.686799         0.0138629    
      1.00000           1.54000          0.737346         0.0272118    
      1.54000           2.40000          0.682716         0.0554876    
      2.40000           4.80000          0.681642         0.0577529    
      4.80000           10.0000          0.680037         0.0857335