# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0208675         0.0183456    
     0.700000           1.00000         0.0358575         0.0107292    
      1.00000           1.54000         0.0287910        0.00289615    
      1.54000           2.40000         0.0314558        0.00174822    
      2.40000           4.80000         0.0371959        0.00148817    
      4.80000           10.0000         0.0366254        0.00199135