# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0258925        0.00647736    
     0.460000          0.700000         0.0322764        0.00620177    
     0.700000           1.00000         0.0325751        0.00841974    
      1.00000           1.54000         0.0181624        0.00840302    
      1.54000           10.0000        0.00302893         0.0184579