linux-source-3.2.0-rc7

[lina <lina.lastname@gmail.com>]

Hi,

a quick question,

Which header I should choose?

linux-headers-3.2.0-rc7-all_3.2~rc7-1~experimental.1_amd64.deb
linux-headers-3.2.0-rc7-all-amd64_3.2~rc7-1~experimental.1_amd64.deb
linux-headers-3.2.0-rc7-amd64_3.2~rc7-1~experimental.1_amd64.deb
linux-headers-3.2.0-rc7-common_3.2~rc7-1~experimental.1_amd64.deb
linux-headers-3.2.0-rc7-rt-amd64_3.2~rc7-1~experimental.1_amd64.deb

what does the last one mean, rt?
and what's the difference among those,

Thanks,

$ uname -a
Linux debian 3.2.0-rc6-3.2-mj-lina #1 SMP Sat Dec 17 13:14:26 SGT 2011 
x86_64 GNU/Linux

the one I built from kernel.org a bit heavy, took so much space. I am 
not sure if I built from debian repository whether it will be light,