A list of available trendlines is displayed. Choose the appropriate trendline to effectively display the chart data. Options include:
1. Linear: straight line for simple, linear data sets
2. Exponential: useful when data values rise or fall at a constantly increasing rate
3. Linear Forecast : creates a line that forecasts future points
4. Moving Average: smoothes the lines to show a pattern or trend more clearly
Additional options are available under More Trendline Options... as well.
Example shown here: Linear.