Bianchi Via Nirone sizing - please help

Hello everybody!
I'm going to buy Nirone Alu Xenon bike, and while I was looking for the right size I was confused with the frame schemes on their website:
http://bianchiusa.com/09_c2c_nirone_alu_sora_comp.html
What exactly does the size A1 means? Is it a virtual c-to-c or c-to-t length?
Thanks a lot!
P.s. Celeste is a nice colour, isn't it?
I'm going to buy Nirone Alu Xenon bike, and while I was looking for the right size I was confused with the frame schemes on their website:
http://bianchiusa.com/09_c2c_nirone_alu_sora_comp.html
What exactly does the size A1 means? Is it a virtual c-to-c or c-to-t length?
Thanks a lot!
P.s. Celeste is a nice colour, isn't it?
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I had a Via Nirone, but in blue - I don't like celeste (just my opinion).
S.
www.thebikewhisperer.co.uk
Singlespeeds in town rule.
I think a 57 frame would be just fine for me - I'm 180cm height (5'11"), inseam 86cm (used a fit calculator from http://www.competitivecyclist.com)
Heh....and now I have it, going along great too