fill_betweenx

Fill the band between two x-curves that share the same y values — the horizontal counterpart of fill_between.

Matplotlib: Axes.fill_betweenx. Coordinates are forwarded as fill_betweenx(y, x1, x2, ...).

Axes: rectangular (ax).

Coordinates

Key	Required	Meaning
y	yes	Shared y positions
x1	yes	First x-curve
x2	no	Second x-curve; defaults to 0

Style

Key	Type	Purpose
facecolor / color	color	Fill color
edgecolor	color	Edge color
alpha	0–1	Opacity
hatch	string	Hatch pattern
where	array	Boolean mask selecting where to fill
zorder	number	Draw order

Any other Axes.fill_betweenx keyword is also accepted.

Example

- name: vband
  data:
    - source: curve
      transform: [ {sortby: y} ]
  axes: ax
  method: fill_betweenx
  coordinates:
    y:  {expr: y}
    x1: {expr: "x - dx"}
    x2: {expr: "x + dx"}
  style:
    facecolor: gray
    alpha: 0.3

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See also: Plot Methods index · fill_between