Table 3 : Results of the ANCOVA test for calibration-pairs for slope and intercept. Red shading indicates differences in parameters with 95% confidence (p < 0.05), yellow shading indicates differences in parameters with 90% confidence (0.05 < p < 0.10), and green shading indicates no statistically significant difference between parameters. Top: ANCOVA results for slope. 27 pairs have a p value > 0.1, demonstrating a convergence of slope when looking at material-specific groups of data. Bottom: Results of the ANCOVA test for calibration-pairs for intercept. This analysis is only performed on calibration pairs that had p-values exceeding 0.1 for the slope analysis. Differences in intercepts between different groups of data in this study were prevalent in 4 pairwise comparisons (p < 0.05), thus, material specific calibrations may be appropriate for climate reconstructions. *Δ47 values were corrected to a 90°C reference frame using AFF presented in Petersen et al. (2019). **Δ47values were corrected to I-CDES using Equation A.7. in Bernasconi et al. (2021).