Comparison between temperature (top panel), LOS velocity (middle panel), and vertical velocity (bottom panel) at the chromosphere during a UF in the numerical simulation (black thick lines) and those inferred from the inversion of the synthetic Stokes profiles (color thin lines). The inversions were performed using different wavelength samplings. They correspond to cases #3, #7, and #12 from the second column of Fig. 1 and share the same color code. They differ with regard to the resolution around the core of the line: δλ = 55 mÅ (red line), δλ = 80 mÅ (green line), and δλ = 110 mÅ (blue line).