Additional file 7 of Multilayered analysis of co-development of business information systems

Evolution of contributions in the technical subsystems at the application and infrastructure layers. Vertices [1]: software developers – Vertices [2]: artifacts (mostly source code) ∙ Edges: contribution relationship ∙ Rating: size of vertices [1] is related to their out-degree. Edge weights are related to contributions. ∙ Time frame: 2008–2014 ∙ Layout algorithm: ForceAtlas2 [86].