1.Ring around a circle indicates medal.
2.Collison detection technique from d3 was used to position overlapping circles.
3.Disqualified Athletes and those with unclear rankings were eliminated from the visualisation.
4.To enable comparison in the visualisation across a large set, four marathon performances where Indian athletes registered high ranks have not been depicted. From 2012, Ram Singh Yadav (rank: 78). From 2016, Nitendra Singh (84), OP Jaisha (89) and Kavita Tungar (120).
5.Rank is shown on an inverted scale to facilitate visual reading of performance.