Sets the x component of the arrow tail about the arrow head. If `axref` is `pixel`, a positive (negative)  component corresponds to an arrow pointing from right to left (left to right). If `axref` is an axis, this is an absolute value on that axis, like `x`, NOT a relative value.

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 an axis, this is an absolute value on that axis, like `y`, NOT a relative value.

Indicates in what terms the tail of the annotation (ax,ay)  is specified. If `pixel`, `ax` is a relative offset in pixels  from `x`. If set to an x axis id (e.g. *x* or *x2*), `ax` is  specified in the same terms as that axis. This is useful  for trendline annotations which should continue to indicate  the correct trend when zoomed.

Indicates in what terms the tail of the annotation (ax,ay)  is specified. If `pixel`, `ay` is a relative offset in pixels  from `y`. If set to a y axis id (e.g. *y* or *y2*), `ay` is  specified in the same terms as that axis. This is useful  for trendline annotations which should continue to indicate  the correct trend when zoomed.

Sets the annotation's x coordinate axis. If set to an x axis id (e.g. *x* or *x2*), the `x` position refers to an x coordinate If set to *paper*, the `x` position refers to the distance from the left side of the plotting area in normalized coordinates where 0 (1) corresponds to the left (right) side.

Sets the annotation's x position. If the axis `type` is *log*, then you must take the log of your desired range. If the axis `type` is *date*, it should be date strings, like date data, though Date objects and unix milliseconds will be accepted and converted to strings. If the axis `type` is *category*, it should be numbers, using the scale where each category is assigned a serial number from zero in the order it appears.

Sets the annotation's y coordinate axis. If set to an y axis id (e.g. *y* or *y2*), the `y` position refers to an y coordinate If set to *paper*, the `y` position refers to the distance from the bottom of the plotting area in normalized coordinates where 0 (1) corresponds to the bottom (top).