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Most, least effective trade deadline acquisitions

Jamie McGinn and Eric Staal were both traded just ahead of the deadline. One of the two has provided excellent return on that investment. Getty Images, USA TODAY Sports

The right deadline acquisition can help secure a playoff berth or an advantageous home seed, while the wrong one can sacrifice long-term assets for a player of no immediate value.

Based on the underlying numbers, which of this year's late-season moves have been the most and least effective down the stretch?