acknowledgments

We thank Jesse Kriss, Frank van Ham, Doug Fritz, Kate Hollenbach, Steve Whittaker, David Millen, and Maneesh Agrawala for insightful discussions. We also would like to thank all the study participants and users of our system.

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Martin Wattenberg ([e-mail]. com), Visual communication lab, ibm t.J. watson research center, cambridge, ma.

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