Average of people mentioned by role by astrophysicist by publishing behavior.

<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0106086#pone-0106086-g004" target="_blank">Figure 4</a> shows the conversational connections to users with different roles or professions based on the publishing behavior of the studied astrophysicists.</p>