0 - 1 of 1 tags for export width

my question is about the output of a UNICODE column in BTEQ.

If I select a column defined like this...
   txt VARCHAR(11) CHARACTER SET UNICODE CASESPECIFIC,
.. it is not 11 characters wide , but it is 33 characters wide
(3 times the number of VARCHARs)

The bteq session character set is UTF8: .set session charset 'UTF8';