The synthetic (left) and observed (right) Stokes V profiles of Fe I 630.15 nm line. The solid lines represent the atmosphere with low LOS velocity (set to zero at all heights in case of synthetic profile). The (+) symbols represent a profile with an upflow (negative LOS velocity); observed in a bright grain and synthesised with LOS velocity set to −2.5 km s^-1 below log (τ) = −0.3. The (∗) symbols represent the Stokes V profile with a positive LOS velocity; created with LOS velocity set to 2.5 km s^-1 below log (τ) = −0.3 and observed in a downflow patch.