A heat map is a grid where each cell renders color and/or size differences to reflect data values. Actipro's heat map presenter control is the marker used in each heat map cell, and automatically handles the color and/or size rendering for its particular data value representation. Box plots are charts used to visualize major statistical values, such as the mean, median, and quartile values of a data set. The mean and median can be shown as bars perpendicular to the chart. The upper and lower quartile values form the edges of a box that contains the middle half of the data.