I have a line graph that plots six lines from information in a data range. The data range is populated based upon which of 50 data sets the person wishes to view. This works great for data sets that have data for all six lines. However, some of the fifty sets have data for only two to five of the lines in the graph. When this is graphed, the line doesn't appear, but the legend for that line is still present. How can I adjust the chart to show only the lines and legend for instances when the data is present.