_pad, then the pads are used instead.

    rect : tuple of 4 floats
        Rectangle in figure coordinates to perform constrained layout in
        [left, bottom, width, height], each from 0-1.

    compress : bool
        Whether to shift Axes so that white space in between them is
        removed. This is useful for simple grids of fixed-aspect Axes (e.g.
        a grid of images).

    Returns
    -------
    layoutgrid : private debugging structure
    N)