  We study ratios of azimuthal-angle distributions in Mueller-Navelet jets
after imposing a rapidity veto constraint: the minijet radiation activity is
restricted to only allow final-state partons separated at least a distance in
rapidity $b$. It is well-known that the asymptotic growth with the rapidity
separation of the two tagged jets of the NLLA BFKL Green's function requires a
value of $b \simeq {\cal O} (2)$ in order to avoid unphysical cross sections.
We further investigate this point from a phenomenological point of view and
work out those values of $b$ which best fit angular distributions measured at
the LHC in a realistic set-up where impact factors and parton distribution
effects are also taken into account.
