Indicates in what coordinates the tail of the annotation (ax,ay) is specified. If set to a ax axis id (e.g. *ax* or *ax2*), the `ax` position refers to a ax coordinate. If set to *paper*, the `ax` position refers to the distance from the left of the plotting area in normalized coordinates where *0* (*1*) corresponds to the left (right). If set to a ax axis ID followed by *domain* (separated by a space), the position behaves like for *paper*, but refers to the distance in fractions of the domain length from the left of the domain of that axis: e.g., *ax2 domain* refers to the domain of the second ax  axis and a ax position of 0.5 refers to the point between the left and the right of the domain of the second ax axis. In order for absolute positioning of the arrow to work, *axref* must be exactly the same as *xref*, otherwise *axref* will revert to *pixel* (explained next). For relative positioning, *axref* can be set to *pixel*, in which case the *ax* value is specified in pixels relative to *x*. Absolute positioning is useful for trendline annotations which should continue to indicate the correct trend when zoomed. Relative positioning is useful for specifying the text offset for an annotated point.

Sets the y component of the arrow tail about the arrow head. If `ayref` is `pixel`, a positive (negative) component corresponds to an arrow pointing from bottom to top (top to bottom). If `ayref` is not `pixel` and is exactly the same as `yref`, this is an absolute value on that axis, like `y`, specified in the same coordinates as `yref`.

Indicates in what coordinates the tail of the annotation (ax,ay) is specified. If set to a ay axis id (e.g. *ay* or *ay2*), the `ay` position refers to a ay coordinate. If set to *paper*, the `ay` position refers to the distance from the bottom of the plotting area in normalized coordinates where *0* (*1*) corresponds to the bottom (top). If set to a ay axis ID followed by *domain* (separated by a space), the position behaves like for *paper*, but refers to the distance in fractions of the domain length from the bottom of the domain of that axis: e.g., *ay2 domain* refers to the domain of the second ay  axis and a ay position of 0.5 refers to the point between the bottom and the top of the domain of the second ay axis. In order for absolute positioning of the arrow to work, *ayref* must be exactly the same as *yref*, otherwise *ayref* will revert to *pixel* (explained next). For relative positioning, *ayref* can be set to *pixel*, in which case the *ay* value is specified in pixels relative to *y*. Absolute positioning is useful for trendline annotations which should continue to indicate the correct trend when zoomed. Relative positioning is useful for specifying the text offset for an annotated point.