Letter reSeArCH
extended data table 1 | Results of mixed-Gaussian models
High T/P Low T/P
Age
(Gyr)Mean
(log10 °C/GPa)Component
Proportion (%)Component
Proportion (%)s.d.Mean
(log10 °C/GPa)s.d.0.2– 02 .920.112.420.10
0.85–0.2 2.81 0.19 2.36 0.09
1.4–0.85 3.08 0.11 2.68 0.08
2.2–1. 43 .050.052.860.23
>2.2 2.96 0.1132
59
78
30
10068
41
22
70
———Mean and standard deviation (s.d.) of the bimodal mixed-Gaussian models shown in Fig. 2b. The distribution of data older than 2.2 Gyr could not be distinguished from a Gaussian distribution at the
95% confidence interval by the Shapiro–Wilk test (n = 72, p = 0.23); for these data the mean and standard deviation of the best-fit single Gaussian distribution are shown. Each distribution <2.2 Gyr
old is distinguishable from a single Gaussian distribution at the 95% confidence interval (2.2–1.4 Gyr old, n = 106, p =5.4 × 10 −^5 ; 1.4–0.85 Gyr old, n = 45, p = 0.017; 0.85–0.2 Gyr old, n = 232,
p = 3.6 × 10 −^7 ; 0.2–0 Gyr ago, n = 109, p = 2.2 × 10 −^7 ).