# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0202971         0.0174859    
      1.00000           1.54000         0.0377263        0.00796652    
      1.54000           2.40000         0.0434705        0.00288627    
      2.40000           4.80000         0.0503379        0.00181504    
      4.80000           10.0000         0.0460309        0.00233507