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In the GUI, it is possible to place "crosses" on the layout (from the "ruler" pull-down menu).
In a script, is it possible to place "crosses" or "points"? If possible with the freedom to define the text that will be displayed (I know how to place ruler annotations, but a ruler of zero length does not really do the job because a value of "0" length is always indicated, and there is no nice cross as compared to what is obtained from the GUI).