The β-O-4 content is negatively correlated with the lignin yield in the sense that high β-O-4 content can only The ratio of syringyl to guaiacyl units is also large when the P-factor is low but is less sensitive to changes in P-factor at higher temperatures. d) Significant amounts of carbohydrates can only be obtained at low to intermediate temperatures and low P-factors. Large measurement uncertainties relative to the local landscape corrugation leads to fitting issues for surrogate model.