Parameter study of the saturated torques felt by a low-mass planet in the range of 0.1 M_⊕ ≤ M_p ≤ 10 M_⊕. Panels A1–A3: solid torques in the BR models normalized by the absolute value of the solid torque in the corresponding NBR models. Panels B1–B3: gas torques in the BR models normalized by the absolute value of the gas torque in the NBR models. Panels C1–C3: total torques in the BR models normalized by the absolute value of the gas torque in the NBR models. Panels D1–D3: total torques in the NBR models normalized by the absolute value of the gas torque in the NBR models. The columns from left to right show three sets of models, each assuming a different steepness of the initial disk density profile, p = 0.5, 1.0, and 1.5. For each planet mass, three accretion efficiencies are examined: η = 0, 0.1, and 1. The colors indicate the different Stokes numbers (St = 0.01, 0.1, 1, 2, 3, 4, 5, and 10) used for the solid species in the parameter study.