Radiocarbon Calibration Curves R package rintcal version 1.4.1 The IntCal20 radiocarbon calibration curves (Reimer et al. 2020 <doi:10.1017/RDC.2020.68>) are provided as a data package, together with previous IntCal curves (IntCal13, IntCal09, IntCal04, IntCal98), other curves (e.g., NOTCal04 [van der Plicht et al. 2004], Arnold & Libby 1951, Stuiver & Suess 1966, Pearson & Stuiver 1986) and postbomb curves. Also provided are functions to copy the curves into memory, and to read, query and plot the data underlying the IntCal20 curves. Software Depends: R (>= 3.5.0) Imports: data.table, jsonlite Suggests: knitr, rmarkdown, utf8 Maarten Blaauw <maarten.blaauw@qub.ac.uk> Comprehensive R Archive Network (CRAN) Maarten Blaauw [aut, cre] (ORCID: <https://orcid.org/0000-0002-5680-1515>), Christopher Bronk Ramsey [ctb] (ORCID: <https://orcid.org/0000-0002-8641-9309>) GPL (>= 2) 2026-06-23 application/tgz https://CRAN.R-project.org/package=rintcal doi:10.32614/CRAN.package.rintcal en-GB