  We give a global bilateral estimate on the maximal solution $\bar u_F$ of $
\prt_tu-\Delta u+u^q=0$ in $\BBR^N\times (0,\infty)$, $q>1$, $N\geq 1$, which
vanishes at $t=0 $ on the complement of a closed subset $F\subset \BBR^N$. This
estimate is expressed by a Wiener test involving the Bessel capacity
$C_{2/q,q'}$. We deduce from this estimate that $\bar {u}_F$ is
$\sigma$-moderate in Dynkin's sense.

Analysis of PDEs