How to know exact size of table with blob column

I have a table with one BLOB column. I ran this query.
select bytes/1024/1024 from user_segments where segment_name='GMSSP_REQUEST_TEMP_FILES'
(user_segments is a view)
it gave me 0.125
It means size of table is 0.125. I have uploaded 3 files to this table. Each of them is of 5 mb. After that I check size of table. but result was same. i.e 0.125.
Can any body tell me how to know exact amount of space consumed by files. I am expecting following result
size should be (5+5+5+0.125)MB
Any help is appreciated.
Thanks.
Akie

http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_1092.htm#i1581211
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:266215435203#993030200346552097

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    http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_1092.htm#i1581211
    http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:266215435203#993030200346552097

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