Time evolution of the semi-major axis (top) and inclination (bottom) of a 20   M_Earth planet in an isothermal H/r = 0.05 disc. The planets initial inclinations reach from i₀ = 1.0° to i₀ = 8.0°. The dashed black line in the top panel indicates a linear fit to the results with a slope of −2  ×  10^-4/orbit. The black dotted lines in the evolution of inclination (bottom) indicate our manual fitting with τ_inc = 53.