Left: best fit for companion-to-star flux ratio, f, for measurements of κ Tuc A. Right: ${\chi }_{\text{red}}^2$ for the position-dependent best-fit flux ratio. Each row corresponds to the different data used for fitting: visibility measurements (top), closure phases measurements (middle), and both visibility and closure phase measurements (bottom). Contour line in the middle and bottom plot mark the regions, where the flux ratio exceeds 1%. Red crosses mark the pixel position corresponding to the minimum ${\chi }_{\text{red}}^2$ value in each case.