I have a line chart that shows activity for one year on the primary Y axis and activity for a second year on the secondary & axis. It would be helpful if both the primary and secondary axes used the same scale to facilitate comparisons between the activity for the two years. But the scale of the secondary axis will frequently be considerably different than that of the primary axis (see attached image to see how it can be misleading). I can see the value of having the axes have their scale automatically formed based on the data, but is there a way to force that secondary axis scale to remain the same as the primary axis scale? If not off the shelf, is this something that could be reasonably customized (and if so, could anybody point me in the right direction?)?