The fitting parameter values: (a) d₁ characterizing the inertial drag force and (b) k characterizing the depth-proportional drag force. The colored dashed lines in both plots represent the scaling expectations d_1s and k_s estimated by Eqs. (3) and (4). The deviation of d₁ from d_1s is less than one order of magnitude and d₁ values tend to approach d_1s in the large v₀ limit. However, k becomes much greater than the scaling expectations particularly in soft (porous and fragile) hierarchical targets. The error bars indicating the standard deviation of five experimental runs.