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The earlier paper [LK] (arXiv:0910.3432) contains a lower bound of thesolution in terms of its $L^1$ norm, which is incorrect. In this note weexplain the mistake and present a correction to it under the restriction thatthe permeability constant $m$ satisfies $1< m <2$. As a consequence, thequantitative estimates on the convergence rate (Main Theorem (c) and Theorem3.6 in [LK] only hold for $1<m<2$. For $m\geq 2$ a partial convergence rate isobtained.

Erratum: Degenerate diffusion with a drift potential: A viscosity solution approach