Accepted answer

Have a look at the documentation for axes, in particular the ticks() function. You can use it (or tickValues()) to control how many (and what) values you want to show.

If you're working with dates, you might want to use a time scale instead of the ordinal one. In particular it will allow you to control the ticks in a more meaningful way, e.g. specify that you want ticks every five years.

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