The expression data for VT-GAL4 lines was generated and is maintained by VrVis (Vienna). The data was gathered in tables (as attached) by Greg Jefferis (MRC-LMB, Cambridge) from the Virtual Fly Brain project using the source code in https://github.com/jefferis/brainbaser. The data are given for each line and by neuropil. The expression level data for each neuropil region was calculated by VrVis.