The coordinates of the values in Z.

X and Y must both be 2-D with the same shape as Z (e.g.created via numpy.meshgrid), or they must both be 1-D suchthat len(X)M is the number of columns in Z andlen(Y)N is the number of rows in Z.

If not given, they are assumed to be integer indices, i.e.X=range(M), Y=range(N).

The height values over which the contour is drawn.

Determines the number and positions of the contour lines / regions.

If an int n, use n data intervals; i.e. draw n+1 contourlines. The level heights are automatically chosen.

If array-like, draw contour lines at the specified levels.The values must be in increasing order.

Enable/disable corner masking, which only has an effect if Z isa masked array. If False, any quad touching a masked point ismasked out. If True, only the triangular corners of quadsnearest those points are always masked out, other triangularcorners comprising three unmasked points are contoured as usual.

Defaults to rcParams['contour.corner_mask'] (default: True).

The colors of the levels, i.e. the lines for contour and theareas for contourf.

The sequence is cycled for the levels in ascending order. If thesequence is shorter than the number of levels, it's repeated.

As a shortcut, single color strings may be used in place ofone-element lists, i.e. 'red' instead of ['red'] to colorall levels with the same color. This shortcut does only work forcolor strings, not for other ways of specifying colors.

By default (value None), the colormap specified by cmapwill be used.

The alpha blending value, between 0 (transparent) and 1 (opaque).

A Colormap instance or registered colormap name. The colormapmaps the level values to colors.Defaults to rcParams['image.cmap'] (default: 'viridis').

If both colors and cmap are given, an error is raised.

If a colormap is used, the Normalize instance scales the levelvalues to the canonical colormap range [0, 1] for mapping tocolors. If not given, the default linear scaling is used.

If not None, either or both of these values will be supplied tothe Normalize instance, overriding the default color scalingbased on levels.

Determines the orientation and exact position of Z by specifyingthe position of Z[0,0]. This is only relevant, if X, Yare not given.

• None: Z[0,0] is at X=0, Y=0 in the lower left corner.
• 'lower': Z[0,0] is at X=0.5, Y=0.5 in the lower left corner.
• 'upper': Z[0,0] is at X=N+0.5, Y=0.5 in the upper leftcorner.
• 'image': Use the value from rcParams['image.origin'] (default: 'upper').

If origin is not None, then extent is interpreted as inimshow: it gives the outer pixel boundaries. In this case, theposition of Z[0, 0] is the center of the pixel, not a corner. Iforigin is None, then (x0, y0) is the position of Z[0, 0],and (x1, y1) is the position of Z[-1,-1].

This argument is ignored if X and Y are specified in the callto contour.

The locator is used to determine the contour levels if theyare not given explicitly via levels.Defaults to MaxNLocator.

Determines the contourf-coloring of values that are outside thelevels range.

If 'neither', values outside the levels range are not colored.If 'min', 'max' or 'both', color the values below, above or belowand above the levels range.

Values below min(levels) and above max(levels) are mappedto the under/over values of the Colormap. Note, that mostcolormaps do not have dedicated colors for these by default, sothat the over and under values are the edge values of the colormap.You may want to set these values explicitly usingColormap.set_under and Colormap.set_over.

Example:

Override axis units by specifying an instance of amatplotlib.units.ConversionInterface.

Enable antialiasing, overriding the defaults. Forfilled contours, the default is True. For line contours,it is taken from rcParams['lines.antialiased'] (default: True).

If 0, no subdivision of the domain. Specify a positive integer todivide the domain into subdomains of nchunk by nchunk quads.Chunking reduces the maximum length of polygons generated by thecontouring algorithm which reduces the rendering workload passedon to the backend and also requires slightly less RAM. It canhowever introduce rendering artifacts at chunk boundaries dependingon the backend, the antialiased flag and value of alpha.

Only applies tocontour.

The line width of the contour lines.

If a number, all levels will be plotted with this linewidth.

If a sequence, the levels in ascending order will be plotted withthe linewidths in the order specified.

Defaults to rcParams['lines.linewidth'] (default: 1.5).

Only applies tocontour.

If linestyles is None, the default is 'solid' unless the linesare monochrome. In that case, negative contours will take theirlinestyle from rcParams['contour.negative_linestyle'] (default: 'dashed') setting.

linestyles can also be an iterable of the above stringsspecifying a set of linestyles to be used. If thisiterable is shorter than the number of contour levelsit will be repeated as necessary.

Only applies tocontourf.

A list of cross hatch patterns to use on the filled areas.If None, no hatching will be added to the contour.Hatching is supported in the PostScript, PDF, SVG and Aggbackends only.