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k's in LRFD Third Edition

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This is probably a stupid question, but what is the difference in the "k's" that are given for wide flange beams in the LRFD third edition.  If I look at a W24x68, I see a k of 1.09 in one column and 1 1/2 in another.  Is this an error or do they mean different things?
Thanks in advance,
Kenneth S. Peoples, P. E.
Lehigh Valley Technical Associates, Inc.
1584 Weaversville Road
Northampton, PA 18067-9039
Phone: (610) 262-6345
Fax: (610) 262-8188
e-mail: kpeoples(--nospam--at)