GISP2 temperature anomalies from d15N fitting using Schwander et al. (1997) firn model and Goujon et al. (2003) firn model reconstructed using stabilized temperature from 70 to 1000 a b2k (Figure 4 and Supplement p. 6 in Döring and Leuenberger 2022, QSR). Ages from 70 to 1000 a b2k not recommend for climatic interpretation. Uncertainty is 2sigma = 0.80...0.88 K for the Schwander et al. (1997) firn model reconstruction and 2sigma = 0.86...0.94 K for the Goujon et al. (2003) firn model reconstruction. The uncertainty is based on mean isotope data resolution of 17.8 a.