# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0129753        0.00719373    
     0.460000          0.700000         0.0181220        0.00483117    
     0.700000           1.00000         0.0220074        0.00793822    
      1.00000           1.54000        0.00677889         0.0124421    
      1.54000           2.40000         0.0227864        0.00801739    
      2.40000           4.80000         0.0156056         0.0119954    
      4.80000           10.0000         0.0113813         0.0207099