# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0245726        0.00216348    
     0.460000          0.700000         0.0288027        0.00251026    
     0.700000           1.00000         0.0324510        0.00257563    
      1.00000           1.54000         0.0360093        0.00251332    
      1.54000           2.40000         0.0389164        0.00324555    
      2.40000           4.80000         0.0369894        0.00390039    
      4.80000           10.0000         0.0335130        0.00556593