Self-gravity force corrections for dust only. We show the dependence of the dust force corrections for different values of the gas-to-dust scale-height ratio (η). For the whole range of η values, the accuracy is better than 0.5%. The dust SGFC is proportional to η at short distances (d_g ≤ 1.5/η). For large values of η, this could favour gravitational clumping. Top: SGFC. Bottom: relative error between SGFC and SLFC (in %): 100 · |SLFC/SGFC − 1|.