Space in pixels to leave on each side of label when placing
            inline. This spacing will be exact for labels at locations where
            the contour is straight, less so for labels on curved contours.
        transform : `.Transform` or `False`, default: ``self.axes.transData``
            A transform applied to ``(x, y)`` before labeling.  The default
            causes ``(x, y)`` to be interpreted as data coordinates.  `False`
            is a synonym for `.IdentityTransform`; i.e. ``(x, y)`` should be
            interpreted as display coordinates.
        NrA