@inproceedings{2009-horizon, title = {Sizing the Horizon: The Effects of Chart Size and Layering on the Graphical Perception of Time Series Visualizations}, author = {Jeffrey Heer AND Nicholas Kong AND Maneesh Agrawala}, booktitle = {ACM Human Factors in Computing Systems (CHI)}, year = {2009}, url = {http://vis.stanford.edu/papers/horizon} }