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              =================   =============================================
              Value               Description
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              'figure points'     Points from the lower left of the figure
              'figure pixels'     Pixels from the lower left of the figure
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              'axes points'       Points from lower left corner of axes
              'axes pixels'       Pixels from lower left corner of axes
              'axes fraction'     Fraction of axes from lower left
              'data'              Use the coordinate system of the object being
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              =================   =============================================

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                def transform(renderer) -> Transform

              where *renderer* is a `.RendererBase` subclass.

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            - A tuple *(xcoords, ycoords)* specifying separate coordinate
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            =================   =========================================
            Value               Description
            =================   =========================================
            'offset points'     Offset (in points) from the *xy* value
            'offset pixels'     Offset (in pixels) from the *xy* value
            =================   =========================================

            Defaults to the value of *xycoords*, i.e. use the same coordinate
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            The properties used to draw a
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            ==========   ======================================================
            Key          Description
            ==========   ======================================================
            width        The width of the arrow in points
            headwidth    The width of the base of the arrow head in points
            headlength   The length of the arrow head in points
            shrink       Fraction of total length to shrink from both ends
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            ============   =============================================
            Name           Attrs
            ============   =============================================
            ``'-'``        None
            ``'->'``       head_length=0.4,head_width=0.2
            ``'-['``       widthB=1.0,lengthB=0.2,angleB=None
            ``'|-|'``      widthA=1.0,widthB=1.0
            ``'-|>'``      head_length=0.4,head_width=0.2
            ``'<-'``       head_length=0.4,head_width=0.2
            ``'<->'``      head_length=0.4,head_width=0.2
            ``'<|-'``      head_length=0.4,head_width=0.2
            ``'<|-|>'``    head_length=0.4,head_width=0.2
            ``'fancy'``    head_length=0.4,head_width=0.4,tail_width=0.4
            ``'simple'``   head_length=0.5,head_width=0.5,tail_width=0.2
            ``'wedge'``    tail_width=0.3,shrink_factor=0.5
            ============   =============================================

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            Key              Description
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            arrowstyle       the arrow style
            connectionstyle  the connection style
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            patchA           default is bounding box of the text
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            shrinkB          default is 2 points
            mutation_scale   default is text size (in points)
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            ?                any key for :class:`matplotlib.patches.PathPatch`
            ===============  ==================================================

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