# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0174530        0.00657925    
     0.700000           1.00000         0.0176629         0.0126455    
      1.00000           1.54000         0.0186602         0.0175123    
      1.54000           2.40000         0.0155357         0.0295655    
      2.40000           4.80000         0.0502567         0.0233478    
      4.80000           10.0000         0.0256984         0.0262219