# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000        0.00310270        0.00396646    
     0.700000           1.00000         0.0104713        0.00562066    
      1.00000           1.54000        0.00633681        0.00650705    
      1.54000           2.40000         0.0142470        0.00567700    
      2.40000           4.80000         0.0161551        0.00668790    
      4.80000           10.0000         0.0107571         0.0133820