Sketch of the relation of vectors and angles between the lab-frame {ê₁, ê₂, ê₃} and the target-frame {â₁, â₂, â₃}. In the applied MC setup the unit vector ê₁ is antiparallel to the direction of the drift velocity Δs. The vectors ê₂ and ê₃ are chosen to create an orthonormal basis together with ê₁ for the gas properties. The target-frame {â₁, â₂, â₃} is defined by the moments of inertia of the dust aggregate. It is assumed that the grain is rapidly rotating around the principal axes â₁ and that the angular momentum J of the grain is parallel to â₁. The rotating dust may perform a stable precession with respect to Δs. Here, the quantities β, Θ, and Φ are the angles of rotation, alignment, and precession, respectively.