Project info  

A Radio Relic and a Search for the Central Black Hole in the Abell 2261 Brightest Cluster Galaxy

Burke-Spolaor, Sarah; Gültekin, Kayhan; Postman, Marc; et al.

The Astrophysical Journal, Volume 849, Issue 1, article id. 59, 12 pp. (2017).

The above is one way to do it.

This is the radio relic paper.

import antigravity
for i in [1 2 3]:
print i