Variation of nfg measured from simulations using the Besançon model (see text) a) in the Galactic plane as a function of longitude; and b) in the Cygnus X region as a function of latitude. The variation with longitude is actually expressed as a function with rGC (see text). These predicted foreground star densities have been derived for a distance from Sun of 1.7 kpc. The adopted linear interpolations are displayed as dashed lines.
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