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We study regularity properties of the free boundary for the thin one-phase problem which consists of minimizing the energy functional $E(u,\Omega )={\int }_{\Omega }{\left|\nabla u\right|}^{2}dX+{\mathscr{H}}^n(\{u>0\}\cap \{x_{n+1}=0\}),\Omega \subset {ℝ}^{n+1},$ among all functions $u\ge 0$ which are fixed on $\partial \Omega$.