# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.704267        0.00616371    
     0.460000          0.700000          0.711935        0.00639784    
     0.700000           1.00000          0.770439        0.00894063    
      1.00000           1.54000          0.760973         0.0172042    
      1.54000           2.40000          0.704796         0.0206947    
      2.40000           4.80000          0.553961         0.0291629    
      4.80000           10.0000          0.526789         0.0561515