re not rectangular).

              In this case *X* and *Y* are 2D arrays with shape (M + 1, N + 1),
              specifying the x and y coordinates of the corners of the colored
              quadrilaterals.

              This is the most general, but the slowest to render.  It may
              produce faster and more compact output using ps, pdf, and
              svg backends, however.

            These arguments can only be passed positionally.

        %(cmap_doc)s

            This parameter is ignored if *C* is RGB(A).

        %(norm_doc)s

            This parameter is ignored if *C* is RGB(A).

        %(vmin_vmax_doc)s

            This parameter is ignored if *C* is RGB(A).

        alpha : float, default: None
            The alpha blending value, between 0 (transparent) and 1 (opaque).

        snap : bool, default: False
            Whether to snap the mesh to pixel boundaries.

        Returns
        -------
        `.AxesImage` or `.PcolorImage` or `.QuadMesh`
            The return type depends on the type of grid:

            - `.AxesImage` for a regular rectangular grid.
            - `.PcolorImage` for a non-regular rectangular grid.
            - `.QuadMesh` for a non-rectangular grid.

        Other Parameters
        ----------------
        data : indexable object, optional
            DATA_PARAMETER_PLACEHOLDER

        **kwargs
            Supported additional parameters depend on the type of grid.
            See return types of *image* for further description.
        rz