I created a chart, based on a pivot table. There are 8 product lines with
the amount on the y-axis and date of sale of the x-axis. I am comparing two
product lines at a time. For one pair all works fine. When I compare the
other two, all data points appear but they are not all connected by the line.
Several points will be connected, then there are just data point for some
dates.

Any ideas?

Carolyn