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@@ -9,6 +9,6 @@ and the type of the marked feature is provided in the
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file.
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Overall the SP that corresponds to the labelled targets represents roughly 60% of
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-the total SP. An SP intervals was defined as tracking a target if it was within
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-7 degrees of visual angle from a target for at least 1/6 of its total
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-duration.
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+the total SP. An SP interval was said to correspond to a given target if it was within
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+7 degrees of visual angle from this target for at least 1/6 of its total
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+duration (to account for tracking inaccuracies).
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