Here are the classes, structs, unions and interfaces with brief descriptions:

color	Structure for saving RGB colors
ColorGradient	Class for saving color gradients (palettes)
HeatMapPlot	Class for plotting a single TH2 (heatmap) and one corresponding legend
Legend	Class for additional legend functionality, mainly additional constructors
Plot	Base class for all plotting functionality
RatioPlot	Class for a rectangle plot displaying ratios
SingleRatioPlot	Class for a rectangle plot with the distributions in the upper pad and the ratios in the lower pad
SquarePlot	Class for a simple square-format plot