Mass evolution comparison inside the Hill sphere for the one-dimensional (blue) simulation and the three-dimensional (orange) simulation. The one-dimensional simulation starts with a slightly higher mass than the three-dimensional simulation because it does not account for the vertical stratification of the circumstellar disk. While the one-dimensional simulation continues to accrete, the three-dimensional simulation reaches a steady state, where the final mass, χ = M_final/M_c = 2.76%, is typical for a mini-Neptune planet.