#vis and dataTable are script parameters.
from Spotfire.Dxp.Application.Visuals import ScatterPlot
v1 = vis.As[ScatterPlot]()
from Spotfire.Dxp.Data import RowSelection, IndexSet
#prepare to unmark all rows
rowSelection = RowSelection(IndexSet(dataTable.RowCount,False))
#set visualization data table marking based on rowSelection
v1.Data.MarkingReference.SetSelection(rowSelection,dataTable)
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