Backing up several tables using pg_dump -t

I'm having problem backing up several tables using pg_dump. When
selecting one table only with the '-t'  option, it works just fine. When
I tried to include several tables, pg_dump fails with error that the
tables specified don't exist. Can you show me an example of backing up
several tables using pg_dump.

Thanks in advance,


--
 Husam

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