# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0612210         0.0191642    
     0.700000           1.00000         0.0493682         0.0142238    
      1.00000           1.54000         0.0697257        0.00694505    
      1.54000           2.40000         0.0698564        0.00601908    
      2.40000           4.80000         0.0692802        0.00610982    
      4.80000           10.0000         0.0633481        0.00667455