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You can toggle curves antialiasing (smoothing) by selecting View → Curves Antialiasing
in main menu.
Please note, that antialiasing slows down drawing.
MagicPlot may denote the data point under the mouse cursor with square brackets. The accurate table value in this point along with table name, row and column numbers are shown in status string in the bottom of main window.
To toggle this option use View → Denote Point under Cursor
menu item.