[en] The evaluations of hight surface weighting function forms describing interrelation between readings of reactor out-of-pile detectors and neutron flux density distribution on reactor vessel external surface are presented for the reactor out-of-pile detectors of power distribution control. The weighting functions are reconstructed according to experimental data obtained at the Novovoronezh NPP power 5-th unit during the test of the prototype system for reactor out-of-pile control of power distribution by the Tikhonov regularization method, which makes it possible to overcome difficulties in the case of reconstructing parameters of multidimensional models. Forms of weighting functions having peak half-width equal to one third of the core height are analyzed