Example of the normalization procedure. Upper panel: Degraded FEROS spectrum of the calibration star HD 20630 before the normalization. The thick black line represents the polynomial that best fits the continuum. The values of the polynomial order, low and high rejection limits, grow parameter, and number of iterations are provided. Lower panel: Same spectrum after the continuum normalization. The black thick line now shows the normalized continuum level at 1.0. The correlation coefficient R2, standard deviation σ, and number of points of the fit are also given.