# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0656866         0.0164844    
     0.700000           1.00000         0.0350518         0.0117318    
      1.00000           1.54000         0.0442010        0.00465317    
      1.54000           2.40000         0.0308770        0.00344081    
      2.40000           4.80000         0.0270871        0.00295479    
      4.80000           10.0000         0.0174715        0.00342842