Well, DS describes the shape of the particle. The F. The frictional coefficient of the particle basically is related to its shape. And we said earlier that the more spherical our particle is, the lower the F value is. And if the F value is lowered and everything else is kept the same, then what that means is if our denominator is lower but the numerator is kept constant, then the S value will increase. And so the more spherical our particle is, the higher arrow sedimentation speed is. So more spherical particles have lower frictional coefficient values F than less spherical particles of equal mass.