- scale-x-continuous #!key name limits breaks trans expandprocedure
- scale-y-continuous #!key name limits breaks trans expandprocedure
- name
- axis title string
- limits
- explicit domain (min max)
- breaks
- explicit tick positions
- trans
- transformation symbol: 'log, 'log10, 'sqrt, …
- expand
- fractional padding added to domain on each side