Monte Carlo simulations of recovering the radial velocities of v = 44 km   s^-1 and v = 37 km   s^-1 as a function of the magnitude of the star. The left panel shows the measured velocities of every spaxel from the 10⁶ realizations as a density contour plot. The magenta and green lines mark the detection limits of 42 km   s^-1 and 35 km   s^-1 for FS1 and FS2 respectively. A spaxel with a velocity lower than 2 km   s^-1 (which corresponds to the error bars) minus the actual radial velocity is not considered to be a detection anymore. The right panel visualizes the probability of detecting a star with a radial velocity of 44 km   s^-1 (magenta) and 37 km   s^-1 (green) as well as their smoothed curves.