  The three-point functions of two scalar fields $\sigma$ and the higher spin
field $h^{(\ell)}$ of HS(4) on the one side and of their proposed holographic
images $\alpha$ and $\mathcal{J^{(\ell)}}$ of the minimal conformal O(N) sigma
model of dimension three on the other side are evaluated at leading
perturbative order and compared in order to fix the coupling constant of HS(4).
This necessitates a careful analysis of the local current $\Psi^{(\ell)}$ to
which $h^{(\ell)}$ couples in HS(4) and which is bilinear in $\sigma$.
