Shows or hides axis link icons. Drop a link on another axis to force them to have the same scale; changing the scale for one axis in a linked set automatically keeps the other axis linked. In the case shown here, the two axes of a single graph have been linked; you can link axes between graphs as well.
The link icons are closed for linked axes.
Disconnect the axes by selecting a closed link and choosing Graph | Unlink [X/Y] Axis.
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