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Extrapolation of span values
Consider the picture below, having two spans in the buffer, namely :
Span 0-1 : value 1
Span 1-2 : value 2
If asking for an extrapolated value for the span 2-3, we would expect to get the value 3 (the dashed line in the figure below). But you could also argue to return the value 2.5.
The difference between the two, is than in the former the extrapolation line is assumed to be a line through the center of the spans, while the latter assumes a line starting at the end of the last span, and having the same slope as the line through the centers.
Which to use?
