Left of the blue line is the observatory, in three columns: instrument, COBALT, and the LTA. The astronomer picks the Measurement Set up from the LTA. That file is correlated visibilities, and pre-processing is the first thing done with it, so correlation is not a column of its own. The gold line is the bottom of the Python wrappers. Above that, on the right, is the user domain: wrappers, then Python applications, then CWL workflows, then a visual interface. Jupyter notebooks belong in that top band; none are in the gap matrices yet. PyBDSF, spinifex, LiLF, Rapthor, ddf-pipeline, and PILOT are still outside the assessed rows.