# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0200466         0.0196063    
     0.460000          0.700000         0.0434463         0.0134456    
     0.700000           1.00000         0.0663035         0.0130675    
      1.00000           1.54000         0.0303912         0.0226760    
      1.54000           4.80000         0.0402288         0.0184308    
      4.80000           10.0000         0.0975638         0.0451487