I have a question regarding colors in bar plots. I want to stack a
total of 18 cost values in each bar. Basically, it is six cost types and
each cost type has three components- direct, indirect, and induced
costs. I would like to use both solid color bars and bars with the
slanted lines (using the density parameter). The colors would
distinguish cost types and the lines would distinguish
direct/indirect/induced. I want the cost types (i.e. colors) to be
stacked together for each cost type. In other words, I don't want all
of the solid bars at the bottom and all of the slanted lines at the top.