Positions graph cursors if they are enabled.
PlaceCursor [/main x-main y-main] [/datum x-datum y-datum]
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                             /datum  | 
                        
                             Location of reference cursor. Position is determined by x-datum . y_datum is only used for non-monotonic curves (e.g. nyquist plots) where there is more than one y value for a given x value.  | 
                    
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                             /main  | 
                        
                             Location of main measurement cursor. Position is determined by x-main . y-main is only used for non-monotonic curves (e.g. Nyquist plots) where there is more than one y value for a given x value.  | 
                    
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