The number of x axis ticks to show.
This option hides tick lines together with tick text. If this option is used on timeseries axis, the ticks position will be determined precisely and not nicely positioned (e.g. it will
have rough second value).
Set the x values of ticks manually.
If this option is provided, the position of the ticks will be determined based on those values. This option works with timeseries data and the x values will be parsed accoding to the type
of the value and data.xFormat option.