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Some of the more complicated figures include "sliders" – little grey dots - which appear when the figure is selected.  A slider is a convenient way of manipulating some of the properties of a figure.  The diagram shows a normal distribution curve.  The sliders allow you to visually adjust the shading on the curve.  The function of the sliders depend on the figure they are attached to so if you ever see a slider move it (by clicking and holding the mouse button as you move the mouse) and look at the changes.  You will find that sliders make many drawing jobs easier.