xaxis-formatter-density, yaxis-formatter-density attribute

Type:"normal", "sparse" or "minimal"
Used By:Graph elements except piegraph
See:xaxis-formatter yaxis-formatter

Sets the density of markers on the x or y-axis of a graph. The default is "normal", which plots between 8 and 14 items on the axis, depending on the data. "sparse" will use between 4 and 7 items instead, and minimal will use either 3 or 4.

If more control than this is required the only way to do it is with a custom formatter