Cisco PIX privilege problem

I have a Cisco PIX 515E running version 6.3.  I wish to limit the privilege of users that login to the PIX.  I have the following commands in my PIX:

aaa-server LOCAL protocol local
aaa authentication ssh console LOCAL
aaa authorization command LOCAL

username pixadmin password 12345 privilege 15
username user1 password abcde privilege 0
username user2 password abcde privilege 1

My problem is that when I login (SSH) to my PIX using user1 and user2 who have been given low privilege, I can do ANYTHING with the PIX; I can perform ANY commands.  Anything wrong with my commands?  Anything is still missing in the configuration?  Please advise.  Thank you.
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All commands should require a level 15 privilege, except a few. Run the command "show privilege all" to see the current privileges required for each command. If they are too low then you look at this page to see how to set them:
Jan SpringerCommented:
I don't use limited privileges on the PIX, but this gives an example:

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hoggieeAuthor Commented:
I think now I understand the reason why.  After logging in with user1 or user2, I proceeded to privilege level with a password of enable_15, that's I have the highest privilege.  I should have proceeded to privilege level by using the password of user1 or user2, only then the privileges would be limited.  Is that correct?
Jan SpringerCommented:
Yes, specify the priv level.
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