questions about /proc/<pid>/map

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Hi,
  I am trying to look at the memory map of processes through
/proc/<pid>/map file. A typical line looks like:
40024000-40025000 rw-p 00002000 08:03 3653662   
/lib/libnss_dns-2.2.5.so

I have a couple of questions:
1. Are the start and end addresses (40024000-40025000) virtual address
or linear address?
2. What does the third number (00002000) mean?
Thank you in advance.

Yue

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