Our research interest concerns how different types of visual aids can help people read tables, as well as characterizing the typical behavior of people with tables. The experiment considers the following four techniques, abbreviated with a single word name for convenience: Plain: Plain data table Zebra: Zebra-striped data table Bar: In-cell bar chart data table Color: Color shading data table A plain table has minimal visual aids. The Zebra tables have a common visual aid that is independent of the data contained in the table: a Zebra table has row-based darkening of the background of alternative rows (excluding headings) The Bar and Color tables encode the information of a given cell into two possible visual aids. Respectively: Bar) the length of a bar that is displayed in the background of the cell (length is proportional to the value, and relative to the values of other cells in the same column), and; Color) the brightness of the color of the background of the cell (the highest the value represented, the darker the red background of a cell, relative to other cells in the same column). The Bar and Color conditions both use data encoding visual aids (of different types), whereas Zebra uses a visual feature (which is non-data encoding, since it does not depend on the values displayed on the table).