early thread on jittering by Alan Eldridge
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Tip from Dan Cory: Can use select * from [Sheet1$A2:G10] in Custom SQL for Excel sources.
Here’s the thread http://community.tableausoftware.com/message/292718?et=watches.email.thread#292718 and the tool Shawn mentioned http://www.winautomation.com/
Especially check out Shawn Wallwork’s comments:
http://community.tableausoftware.com/message/292973#292973
Post linking to Mark Jackson’s work
http://community.tableausoftware.com/docs/DOC-5592