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How does SIZE (LP) work when there are no opposing points?

Like title.

For any even spread, even-numbered hit circle there will be opposing points, so OK for LP.
But how is this calculation done when we don't have even spread, even-numbered circles, for example a 5, 7, 9, 11, etc hit circles? We are still getting a result from the SIZE (LP), but how is that calculated? Inter/extrapolation?

neil.challinor