The script [powercontoursmean.R][1] builds [Figure 1][2] of the paper by numerical simulation.
The script [app.R][3] is a [Shiny][4] application to generate power contours using a web interface. It can be accessed online at: https://shiny.york.ac.uk/powercontours/
[1]: https://osf.io/4wgx2/
[2]: https://osf.io/827p3/
[3]: https://osf.io/pq235/
[4]: https://shiny.rstudio.com/