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Each extended Cartan--Eilenberg system $(H, \partial)$ gives rise to twoexact couples and one spectral sequence. We show that the canonical colim-liminterchange morphism associated to $H$ is a surjection, and that its kernel isisomorphic to Boardman's whole-plane obstruction group $W$, for each of the twoexact couples.

Boardman's whole-plane obstruction group for Cartan-Eilenberg systems