Extended Data Table 2.
Probability analysis
The probability (last column, in 10−5) for the recent value to occur under the pre-industrial distribution is listed for different parameter combinations of creating and analysing the NGT-2012 stack. Settings named ‘default’ denote: pre-industrial period = 1000–1800; recent period = 2001–2011; filter window = 11 yr. The first five rows correspond to the different analysis variants of using the stack as in the main text (‘main stack’), applying full forward diffusion on the main stack, building the main stack with a fixed number of records through time, and using a simple stack (with and without forward diffusion) built from averaging across all available isotope records without merging old and new records (see also Extended Data Fig. 3).