# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0133244        0.00927791    
     0.700000           1.00000         0.0338963         0.0126454    
      1.00000           1.54000         0.0444849        0.00717244    
      1.54000           2.40000         0.0361945        0.00581878    
      2.40000           4.80000         0.0302391        0.00433913    
      4.80000           10.0000         0.0259494        0.00482286