NPashaP
The left diagram uses the default radii (inner=180, outer=200) and the right has custom radii (inner=190 and outer=195).
Modified http://vizjs.org/viz.v1.1.0.min.js to a secure url
https://d3js.org/d3.v4.min.js
https://vizjs.org/viz.v1.1.0.min.js