The difference will be indicated by bars. The color
of the bar will be significant for positive or negative
differences between open and closed data.
If this property is false, the values of the first
series (or second if StockDiagram::Volume is
true) of the chart data are interpreted as the day's lowest
value. The next series is interpreted as the day's highest
value, and the last series is interpreted as the closing
value.
If this property is set to true, one additional series
is needed with the opening value of the stocks. It is assumed
as the series before the series with the day's lowest
value.