Example of inter-relationship between two track's data in TnT Board. In the example, the data in the first track is empty by definition, but the second track shares its data with the first track and calls its update method.
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://tntvis.github.io/tnt.board/build/tnt.board.min.js to a secure url
https://d3js.org/d3.v3.min.js
https://tntvis.github.io/tnt.board/build/tnt.board.min.js