Reduced chi square (top) and (bottom)associated with the RWST fits of the WST coefficients that take into account lattice terms (see Eqs. (C.1) and (C.2)) for the data set. Each curve in the plot corresponds to a fixed j₁ value while j₂ ranges from j₁ + 1 to J − 1 = 6. For j₁ = J − 2, the curve is reduced to a single dot on the figure. We use logarithmic scales for better visibility.