# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.245959        0.00417554    
     0.460000          0.700000          0.261014        0.00375382    
     0.700000           1.00000          0.292768        0.00427472    
      1.00000           1.54000          0.428054        0.00826108    
      1.54000           2.40000          0.419120         0.0135035    
      2.40000           4.80000          0.329996         0.0216580    
      4.80000           10.0000          0.217997         0.0471934