Projection of the χ² hyper surface with respect to T_eff, log g, ξ and the Fe abundance for γ Dor star KIC 7365537. The black dots are χ² values for all the grid nodes, the black curve is a polynomial fit with the best-fit value as minimum, and the red crosses show the intersection points of this fit with the 1σ χ² level (the horizontal line) and give the errors on the best-fit value.