chartWidget = pg.PlotWidget()
chartWidget.plot([None, None, 1 2], name="2012", symbol='o')
chartWidget.plot([4, 5, 6, 7], name="2013", symbol='o')
chartWidget.plot([8,9, None, None], name="2014", symbol='o')
In this case the first and last plots, the line is trauncated with no data to preset
tia
regards
pete