How do you distinguish Connected Presence, Absent Presence, and Present Absence" ?

When reading about "Mobile Revolution", I came across the different concepts: Connected Presence, Absent Presence, and Present Absence. Could you differentiate the three concepts? 

“absent presence” can "created awkward, annoying social discontinuities as people 'leave' the group they are physically a part of to take a call or respond to a text message from someone afar" (Rainie &Wellman, 2012, p. 2713). 

"Moreover, Europeans often sit among friends at cafés while simultaneously using their mobile phones to incorporate absent friends into their group conversations. To complement Gergen’s notion of “absent presence,” we call this 'present absence'" (Rainie &Wellman, 2012, p. 2740) 

Rainie, L., & Wellman, B. (2012). The Mobile Revolution. In Networked: The New Social Operating System (pp. 2711-2740). The MIT Press. Kindle Edition.”