Sketch of a variation of χ² statistics as a function of parameter θ_i for an iteration step (n) in blue and (n + 1) in orange. The points demonstrate the grid points in θ_i, with a grid step size of Δθ_i, where the χ² is computed. The coloured arrows highlight the value of the parameter at the minimum of the χ² statistics on the x axis and the absolute value of the statistics on the y axis.