Empty points are data points that do not have Y values or have been marked as empty. They are visually displayed in the chart area. Empty points are not the same as missing data points, which  refer to data points that are missing in a data set.

The following example shows that there is no data for Wednesday.

Missing Data?
 
X Y
Monday 978
Tuesday 345
Thursday 567
Friday 778
Saturday 46
Sunday 78

If the X values of the plotted series are indexed, then it is possible that the missing data is can be overlooked by the chart reader (see the figure below).

Missing Data and Indexed Points

In this case, use an empty point to clarify that a data point is missing. For example:

Missing Data and Indexed Points

Empty Points Usage

Use empty points to:

Empty data points can be added to a series using:

Empty Points Styles

Empty points can be displayed as a marker or a line that connect the nearest two points. It can be displayed as an average of the adjacent points or as having a value of zero (see the figure below).