For POST, I imagine it as posting an entry x periods before or after. From a logic evaluation perspective, if you look at the 6,000 in Feb 15, it's comprised of ALL POSTs that would hit Feb 15. Jan 15 posts 3,000 1 period later Feb 15 posts 1,000 in its period Mar 15 posts 2,000 1 period back Feb 15 would then aggregate all POSTs for that period. You wouldn't evaluate it as a siloed period - it's an amalgamation of all periods that POST to it. If Jun 15 had a POST(1000,-4), Feb 15 would then have 7,000 in its cell.
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