# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0708539        0.00159469    
     0.460000          0.700000         0.0800532        0.00152743    
     0.700000           1.00000         0.0826952        0.00182224    
      1.00000           1.54000         0.0947271        0.00211937    
      1.54000           2.40000          0.106625        0.00321659    
      2.40000           4.80000          0.121429        0.00429424    
      4.80000           10.0000          0.111585        0.00838291