Scales
Scales might be defined as a graphical representation of a chart axis and are automatically configured by a chart when it is created.
A scale is composed of the following elements:
An axis representation, which depends on the chart projection (could be a line or an arc).
Major ticks, the marks drawn on the axis at each step of the scale.
Steps labels, drawn next to the major ticks. These labels indicate the values of the coordinate represented by the scale.
Minor ticks, the marks drawn on the axis at each substep of the scale.
A title, which can be placed anywhere along the axis representation.
Depending on the type of chart, scales can be:
Rectangular (that is, axes that are parallel to the x- and y-axes of the screen).
Circular (generally used in Polar charts).
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