Dear all,

I have a 'Stacked Column Chart' that indicates the total cost of numerous
buildings and the breakdown of buildings' costs.

X-axis: name of each building
Y-axis: cost

I wish to add two lines accross the graph. One for the mean total cost and
another for the median total cost. Assuming it is possible, how would I go
about doing this?


Thanking-you in advance,

Neil