Left: χ² values as functions of the local dark matter density for various combinations of the scale heights of the thin and thick disks. The (light to dark) blue curves have kpc and kpc, while those from orange to dark red have kpc and kpc. The thick black curve corresponds to the global minimum of the χ² landscape, which is found for the model with kpc and kpc. The horizontal dashed line indicates a Δχ² = 1 with respect to this minimum χ²-value. Right: map showing the dependence of the best-fit values of the local dark matter density on the adopted scale height for the thin (x-axis) and thick (y-axis) disk. The total χ² is minimum at the position of the star symbol. The yellow lines indicate where the total baryonic surface mass density in the models equals 35, 40, 45, 50, and 55 M_⊙ pc⁻².