This function creates a pith offset data structure based on wood completeness data.
Computes the sum of the variables
data.frame containing two variables. Variable one
series) gives the series ID as either
factors. These match
rownames(wc). Variable two (
integer type and gives the years from the beginning of the
core to the pith (or center) of the tree. The minimum value is 1.
1 2 3
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