The c-axis resistivity in irradiated and in pristine BSCCO(2212) crystals ismeasured as a function of the in-plane magnetic field component at fixedout-of-plane component B_\perp in the vortex liquid phase at T=67 K. From thisdata we extract the dependence of the phase difference correlation lengthinside layers on B_\perp and estimate the average length of pieces of vortexlines confined inside columnar defects as a function of the filling factorf=B_\perp / B_\phi. The maximum length, about 15 interlayer distances, isreached near f=0.35.
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