Adding a Custom Point Annotation
Add a custom point annotation to read the value and highlight a point of interest on the graph.
Select the trace where you want to read the point.
        - 
                Add a single point annotation to indicate the global maximum of the selected
                    trace.
                
- 
                        On the Cartesian
                        context tab, on the Measure tab, on the Custom annotations group, click the 
 Points icon. From the drop-down list, click 
 Global maximum.
                     
An annotation is added to the trace to highlight the maximum value. The annotation updates if the data changes. - 
                        On the Cartesian
                        context tab, on the Measure tab, on the Custom annotations group, click the 
 - 
                Add a custom single point annotation to indicate the first local minimum to the
                    left (relative to the global maximum).
                
- 
                        On the Cartesian
                        context tab, on the Measure tab, on the Custom annotations group, click the 
 Points icon. From the drop-down list, click 
 Other.
                     

Figure 1. The Configure annotation dialog.- In the Definition field, from the drop-down list, select First local maximum to the left.
 - Under Relative to, click Global maximum.
 - [Optional] Under Text, clear the Auto text check box and add the text you want displayed in the annotation.
 
 - 
                        On the Cartesian
                        context tab, on the Measure tab, on the Custom annotations group, click the 
 - Click Create to create the annotation and to close the dialog.