Apply a jitter effect for the rendered markers. When plotting
discrete values, a little random noise may help telling the points
apart. The jitter setting applies a random displacement of up to n
axis units in either direction. So for example on a horizontal X
axis, setting the jitter.x to 0.24 will render the point in a
random position between 0.24 units to the left and 0.24 units to the
right of the true axis position. On a category axis, setting it to
0.5 will fill up the bin and make the data appear continuous.
When rendered on top of a box plot or a column series, a jitter value of 0.24 will correspond to the underlying series' default groupPadding and pointPadding settings.
Note: With boost mode enabled, the jitter effect is not supported.