Acknowledgements

We would like to thank Stuart Lee and Heike Hofmann for their feedback about this work. The most recent version of the frame_calendar function is included in the sugrrants R package, which can be accessed via the CRAN website https://CRAN.R-project.org/package=sugrrants or Github https://github.com/earowang/sugrrants. All materials required to reproduce this article and a history of the changes can be found at the project’s Github repository https://github.com/earowang/paper-calendar-vis.