  We assume that the quark-flavor coefficients matrix of the semileptonic
operators addressing the neutral-current B-meson anomalies has rank-one, i.e.
it can be described by a single vector in quark-flavor space. By correlating
the observed anomalies to other flavor and high-$p_T$ observables, we constrain
its possible directions and we show that a large region of the parameter space
of this framework will be explored by flavor data from the NA62, KOTO, LHCb and
Belle II experiments.
