  The formation of stripes in six-leg Hubbard ladders with cylindrical boundary
conditions is investigated for two different hole dopings, where the amplitude
of the hole density modulation is determined in the limits of vanishing DMRG
truncation errors and infinitely long ladders. The results give strong evidence
that stripes exist in the ground state of these systems for strong but not for
weak Hubbard couplings. The doping dependence of these findings is analysed.
