# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0237378        0.00637724    
     0.460000          0.700000         0.0272474        0.00599895    
     0.700000           1.00000         0.0389418        0.00681100    
      1.00000           1.54000         0.0395726        0.00743865    
      1.54000           2.40000         0.0314316         0.0115373    
      2.40000           4.80000         0.0113372         0.0227421    
      4.80000           10.0000         0.0465944         0.0210661