Figure 3 illustrates a data series for Variable with Stepped = True and an Aggregate that uses Interpolated Bounding Values. The request being processed has a Start Time that falls before the first point in the series and an End Time that does not fall on an integer multiple of the ProcessingInterval.

Figure 3 – Variable with Stepped = True and Interpolated Bounding Values

The first interval has three regions:

• the period before the first data point;
• the period between the first and second where SteppedInterpolation is used;
• the period between the second and the interpolated end bound.

The Bad point is ignored because of the interpolated end bound but this does create Uncertain regions. If SlopedInterpolation was used the Uncertain region would start at the second point. In this case, it only starts when the first Bad value is ignored.

The second interval has three regions:

• the period between the start bound and the first data point;
• the period between the first and second where SteppedInterpolation is used;
• the period between the second and the interpolated end bound.

The third interval has three regions:

• the period between the interpolated bound and the first data point;
• the period between the first point and an interpolated point that falls on the end time;
• the period after the end time which is ignored.

This is a partial region and the data after the end time is not used.