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At the score screen, under graphs tab, what exactly is upgrade spending? Well it sounds obvious but why does it decrease sometimes?

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up vote 10 down vote accepted

Upgrade spending tracks your tech in general, not just "upgrades". So if you build a roach warren, it will show in this graph. If you then lose the roach warren, the graph will reflect this loss in tech.

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+1 for guessing right that I am I zerg player:) – Varaquilex May 6 '13 at 14:47

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