Neutrino Lower-Bound Mass Derivation?

[frazzle]

I was wondering if anyone could help clarify this problem I am having.

 

Upon reading a section in a paper, I am a bit stuck as to how this value of the lower bound of the neutrino mass is reached here. I have highlighted the relevent part in the snapshot below:

 

 

http://img487.imageshack.us/img487/3873/neutrinomass3fk.jpg

 

 

Is there something missing from this passage, or am I just missing something blindingly obvious? I can't seem to understand how the two squared mass differences coupled with the assumption of hierarchy lead to the quoted value!

 

in case you're curious, the paper is:

 

http://www.arxiv.org/PS_cache/astro-ph/pdf/0407/0407207.pdf

 

thank you!