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Data Structures
Here are the data structures with brief descriptions:

QCP |
QCPAbstractItem | The abstract base class for all items in a plot
QCPAbstractLegendItem | The abstract base class for all entries in a QCPLegend
QCPAbstractPlottable | The abstract base class for all data representing objects in a plot
QCPAxis | Manages a single axis inside a QCustomPlot
QCPAxisRect | Holds multiple axes and arranges them in a rectangular shape
QCPBarData | Holds the data of one single data point (one bar) for QCPBars
QCPBars | A plottable representing a bar chart in a plot
QCPColorGradient | Defines a color gradient for use with e.g. QCPColorMap
QCPColorMap | A plottable representing a two-dimensional color map in a plot
QCPColorMapData | Holds the two-dimensional data of a QCPColorMap plottable
QCPColorScale | A color scale for use with color coding data such as QCPColorMap
QCPCurve | A plottable representing a parametric curve in a plot
QCPCurveData | Holds the data of one single data point for QCPCurve
QCPData | Holds the data of one single data point for QCPGraph
QCPGraph | A plottable representing a graph in a plot
QCPGrid | Responsible for drawing the grid of a QCPAxis
QCPItemAnchor | An anchor of an item to which positions can be attached to
QCPItemBracket | A bracket for referencing/highlighting certain parts in the plot
QCPItemCurve | A curved line from one point to another
QCPItemEllipse | An ellipse
QCPItemLine | A line from one point to another
QCPItemPixmap | An arbitrary pixmap
QCPItemPosition | Manages the position of an item
QCPItemRect | A rectangle
QCPItemStraightLine | A straight line that spans infinitely in both directions
QCPItemText | A text label
QCPItemTracer | Item that sticks to QCPGraph data points
QCPLayer | A layer that may contain objects, to control the rendering order
QCPLayerable | Base class for all drawable objects
QCPLayout | The abstract base class for layouts
QCPLayoutElement | The abstract base class for all objects that form the layout system
QCPLayoutGrid | A layout that arranges child elements in a grid
QCPLayoutInset | A layout that places child elements aligned to the border or arbitrarily positioned
QCPLegend | Manages a legend inside a QCustomPlot
QCPLineEnding | Handles the different ending decorations for line-like items
QCPMarginGroup | A margin group allows synchronization of margin sides if working with multiple layout elements
QCPPainter | QPainter subclass used internally
QCPPlottableLegendItem | A legend item representing a plottable with an icon and the plottable name
QCPPlotTitle | A layout element displaying a plot title text
QCPRange | Represents the range an axis is encompassing
QCPScatterStyle | Represents the visual appearance of scatter points
QCPStatisticalBox | A plottable representing a single statistical box in a plot
QCustomPlot | The central class of the library. This is the QWidget which displays the plot and interacts with the user

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