  The possibility to explain quantum correlations via (possibly) unknown causal
influences propagating gradually and continuously at a finite speed v > c has
attracted a lot of attention recently. In particular, it could be shown that
this assumption leads to correlations that can be exploited for superluminal
communication. This was achieved studying the set of possible correlations that
are allowed within such a model and comparing them to correlations produced by
local measurements on a four-party entangled quantum state. Here, we report on
a quantum state that allows for the same conclusion involving only three
parties.
