How to restore the table space tar files created by pg_basebackup?

Hi all,

I have taken a base backup of my master server using pg_basebackup command
as below:
pg_basebackup -D /tmp/PostgresBackup/ -Ft -Z 9 -l masterbackup -h
localhost -U replication -w

The above created 4 tar files, namely: 16394.tar.gz 16395.tar.gz
16396.tar.gz base.tar.gz

I do know that my database contains 3 table spaces in addition to
pg_default and pg_global ( I guess, that is why it created those three
numbered tar.gz files, plus one base.tar.gz file ) and my master and
standby servers are identical by all means.

Now, I'm not sure how can I restore these files on the standby server. I
could restore the base.tar.gz into the data directory on standby and the
streaming replication has started working properly. But I'm not sure what
to do with these additional numbered gz files which contains the same data
that is already contained in the base.tar.gz file.

Can some one explain me what to do with these files? The documentation for
pg_basebackup does not mention this information, it just says that a
different variant of the command will fail if there are multiple table
spaces.

Another related query is if we can specify the name of the backup file
instead of leaving it to be base.tar.gz file.

Thanks and Regards,
Samba