File size difference between table in database and exported file

Could there be a reason for the big diference between a table size in database and the size of the exported file ?

table size : 1.8 Gb (select bytes from dba_segment where segment_name = T1) and (select blocks from dba_tables where table_name = T1) exp user_at_database file=F1 table=T1 direct=y raws=y exported file : 2.43 Gb (ls -l F1 | awk {'print $5i/1048576 " Mo"'}

Oracle version 8.0.6
OS AIX 4.3.1 Oracle support don't have any answer to this. Received on Fri Feb 25 2000 - 03:21:10 CST