Single-step wCC for the eight solar wind parameters, calculated separately after grouping the test windows by calendar year, covering 2009–2023. Each yearly group contains 3–6 test windows from the test set. The dotted line indicates wCC = 0.99; the lower half of the broken axis is used to accommodate a small number of very low points. The gray and light-blue shading represent the maxima and minima of solar cycles 24–25, respectively.