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Sections 3 and 4 of “Lefschetz fibrations on compact Stein surfaces” [Geometry and
Topology 5 (2001) 319–334] contained errors due to insufficient care with framing
conventions. This note corrects these errors. The following material is a verbatim
substitute for half of section 3 and section 4 starting at the heading “General case”
on page 330.
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