# What is Hermite data?

Using fairly simple language, what is Hermite data? I encountered it here, http://www.frankpetterson.com/publications/dualcontour/dualcontour.pdf and could not get an answer on standard StackExchange, who 'referred' me to here.

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Thanks!${}{}{}{}$ –  t.b. Jun 28 '11 at 21:00