Is 15GB the size of the data or the size of the database including free space?

>Hi:
>
>I have a 15 Gb Database in SQL Server.
>
>Every day i build a replication in another machine but the output database is reduced to 9 Gb. Everything run fine in the replicated database.
>
>My question is: a replication process execute any instruction similar to a PACK in FoxPro?
>
>I can from DOS windows send any instruction (without replication) to reduce (perhaps PACK) the database?
>
>Best,
>
>Alberto Rodriguez