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The segment "UV with Carts" means: identify all unique visitors where,
in all of a visitor's hits, at least one of those hits contains a
"scOpen" event.Then, the calculated metric means: count the number of
unique visitors belonging to the segment "UV with Carts".The end result
is that the calculated metric returns the number of unique visitors that
had at least one of their hits containing a "scOpen" event.