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Up/down bars connect the data points of a pair of series, and assume a different style based on whether the value in the first (as defined by their order in the SeriesCollection) is larger or smaller than the value in the second series. By default, up/down bars use AutomaticFill and AutomaticLine for all their colors. This shows up in Excel as the up bars having a white interior and the down bars having a black interior. Note that points where the first and second series have the same value display down bars.

Scatter and area charts do not support up/down bars, so while you can set the up/down bar properties, they will not appear in the output of a scatter or area series.