Table 2. Calibration and verification statistics for the reconstruction of summer-autumn (Dec–May) total precipitation in semi-arid northwest Australia from the Callitris columellaris ring-width chronology.

Calibration Period	r	R2 Adj.	Verification Period	r	RE	CE
Late (1960–2012)	0.85	0.71	1910–1959	0.75	0.60	0.48
Early (1910–1959)	0.75	0.55	1960–2012	0.85	0.70	0.65
Full (1910–2012)	0.81	0.66	-	-	-	-

Precipitation is the CRU 3.22 0.5° gridded dataset area-averaged over the 5° study region (117–122°E, 21–26°S, Fig 1). r is the Pearson correlation coefficient, R² _Adj is the coefficient of determination adjusted for the number of terms in the model, RE is the Reduction of Error, CE is the Coefficient of Efficiency. All p-values associated with correlation values (r) are < 0.0001.