[1] Vrije Univ Amsterdam, Eth Comp, User Centr Data Sci Grp, NL-1081 HV Amsterdam, Netherlands
[2] Univ Utrecht, Visual Analyt Visualizat & Graph Grp, Dept Informat & Comp Sci, NL-3512 BS Utrecht, Netherlands
[3] Kings Coll London, Data Visualizat, London WC2B 4BG, England
[4] Kings Coll London, Human Ctr Comp Grp, London WC2B 4BG, England
[5] Georgia Tech, Comp, Atlanta, GA 30308 USA
[6] Ontario Tech Univ, Comp Sci, Oshawa, ON L1G 0C5, Canada
[7] Ontario Tech Univ, Canada Res Chair Linguist Informat Visualizat, Oshawa, ON L1G 0C5, Canada
[8] Univ Oklahoma, Data Inst Societal Challenges, Norman, OK 73019 USA
[9] Univ Konstanz, D-78464 Constance, Germany
[10] Georgia Tech, Sch Interact Comp, Atlanta, GA 30332 USA
[11] Univ Konstanz, Data Anal & Visualizat Res Grp, D-78464 Constance, Germany
[12] Univ Konstanz, Comp Sci, D-78464 Constance, Germany
[13] Fraunhofer IGD, Competence Ctr Informat Visualizat & Visual Analy, D-64283 Darmstadt, Germany
[14] Offenburg Univ, Machine Learning, D-77654 Offenburg, Germany
[15] Tampere Univ, Fac Informat Technol & Commun Sci, Stat & Data Anal, FI-33014 Tampere, Finland
[16] Jonkoping Univ, Sch Engn, Comp Sci, SE-55111 Jonkoping, Sweden
[17] Graz Univ Technol, Inst Comp Graph & Knowledge Visualizat, A-8010 Graz, Austria
[18] IBM Res, Cambridge, MA 02142 USA
[19] Eindhoven Univ Technol, Dept Math & Comp Sci, Visualizat, NL-5612 AE Eindhoven, Netherlands