Inversion of Ca I 4227 fractional Stokes profiles at μ = 0.07 synthesized in the static FAL-C model in the presence of a heightdependent magnetic field for two different initial guesses: IG-1 (top panel) and IG-2 (bottom panel). Left column: magnetic field magnitude, B, inclination, θ_B, and azimuth, χ_B of the original model (blue dots) and two-nodes fitted (red lines) quantities. Right column: synthetic input I^obs (blue dots), and retrieved I^out (red lines), fractional polarization Q/I, U/I, and V/I profiles.