# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.270471        0.00596686    
     0.460000          0.700000          0.267612        0.00564543    
     0.700000           1.00000          0.318688        0.00670586    
      1.00000           1.54000          0.432031         0.0102023    
      1.54000           2.40000          0.473779         0.0174048    
      2.40000           4.80000          0.440346         0.0317917    
      4.80000           10.0000          0.271560         0.0672177