Different sources of uncertainties of the SN reconstruction plotted at the 1σ level: radiocarbon measurement errors (red Δ¹⁴C line), geomagnetic models (blue VDM line), model uncertainties (magenta line) including both the computation of the OSF and the OSF-to-SSN conversion, and the total uncertainty (green line), which is close to the geometrical sum of the individual uncertainties. The dashed black line represents the diagonal.