Field measurements at calibration positions x₀ = 0 mm, x₁ = 5 mm, x₂ = 10 mm, x₃ = 15 mm, x₄ = 20 mm and x₅ = 25 mm with ∆x = 0 mm, meaning that the measurements are taken at the same position as the calibration. To show all field measurements in one plot, the signals are shifted by an offset of 0.1 mm times index i of x _i , so the measurements at field position x₀ are shown in the lowest and at x₅ in the highest plot.