Gas and grown dust surface density distributions (top and bottom rows, respectively) together with superimposed velocity fields in models C3 (prograde collision, left column) and C3r (retrograde collision, right column). The gas and grown dust velocity fields are shown with the green and yellow arrows, respectively. The arrow length is in the log scale. The arrows of maximum length correspond to 2.1 km s⁻¹. The gas and dust color scale bars are in log g cm⁻².