The data is described in the paper: A conversation around the analysis of the SiP effort estimation dataset by Derek M. Jones and Stephen Cullum.
Blog post What is known about software effort estimation in 2024.
The Projects chapter of my book, Evidence-based Software Engineering, analyses the publicly available data on the subject; code+all data.
If you make use of this data in a paper, please let us know.
Fullstack D3 and Data Visualization by Amelia Wattenberger, uses the SiP dataset in example plots.