Simulated detector intensities for the planet and star for a single fiber containing the Airy core of the respective source. In the top panels, the gray lines show the results for each of the 20 individual Bragg gratings, with the black line showing the total response of the multiplexed Bragg grating, which is the sum of all gratings. The large, Gaussian-shaped intensity profile is due to the wavelength-dependent transmission of the grating. In the bottom panels we show the ratio between these total responses and the response to a flat input spectrum as a measure of the average spectrum seen by the instrument.