# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0166776        0.00779609    
      1.00000           1.54000         0.0717595        0.00747325    
      1.54000           2.40000         0.0699026        0.00608719    
      2.40000           4.80000         0.0567735        0.00467128    
      4.80000           10.0000         0.0337404        0.00540462