xlChartPictureType

Specifies how pictures are displayed on a column, bar picture chart, or legend key.

xlStack	Picture is sized to repeat a maximum of 15 times in the longest stacked bar (2)
xlStackScale	Picture is sized to a specified number of units and repeated the length of the bar (3)
xlStretch	Picture is stretched the full length of the stacked bar (1)

xlStack

Picture is sized to repeat a maximum of 15 times in the longest stacked bar (2)

xlStackScale

Picture is sized to a specified number of units and repeated the length of the bar (3)

xlStretch

Picture is stretched the full length of the stacked bar (1)