Percentage of people mentioned by role by astrophysicist on average by tweeting behavior.

<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0106086#pone-0106086-g003" target="_blank">Figure 3</a> shows the conversational connections to users with different roles or professions according to the tweeting activity of the astrophysicists.</p>