Scale options of one axis (line x: log needs numeric x; index / time x stay linear).
x
Optional
Inverted axis: values grow downward (y) / leftward (x) (default: false)
Default: 'linear'
'linear'
Target tick count (default: chart density, grid rows for y, ~1 per 90 px for x)
Scale options of one axis (line x: log needs numeric
x; index / time x stay linear).