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This paper presents usages, examples, and mathematical backgrounds of a Python script, UPbplot.py, which was newly developed for calculation and visualization of U–Pb age data. The script is a collection of various functions to deal with the oneand two-dimensional weighted means, concordia ages, and concordia-intercept ages on the conventional (Wetherill) and Tera–Wasserburg concordia diagrams for U–Pb age data. This script can calculate those ages and output images including concordia diagrams, bar plots, and histograms.

A new tool for calculation and visualization of U–Pb age data: UPbplot.py