Fringe indices in small subsets are highly inaccurate and expressing an index like this in tenths is meaningless as indices are non-linear and the exact subset could vary any actual index by a large amount. How you obtained the subset also comes into play as end of shoe and a very small ST PZ are quite different even if you are entirely within the PZ. With this small a subset, it is more likely the round will play partially out of the PZ making the index even less accurate. Use such indices as you wish; but stating here that they are absolutely accurate is incorrect. Actually, there is no such thing as an absolutely accurate index.
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