Regional chronologies based on nested PCs display high correlation coefficients in the two calibration periods: both regression-calibrated (r1900_1952 = 0.81 and r1953_2005 = 0.75 on average) and scaling-calibrated (r1900_1952 = 0.73 and r1953_2005 = 0.80 on average). Similarly REs are also high (well above 0) for the two verifications.