  A compilation of H1 and ZEUS cross section measurements for elastic vector
meson production is presented as a function of the scale $K^2 = (Q^2+M_V^2)/4$,
where Q^2 is the exchanged photon virtuality and M_V is the mass of the vector
meson. The ratio of longitudinal to transverse cross sections R =
$\sigma_L/\sigma_T$ is presented as a function of Q^2/M^2_V. The cross sections
are separated in a transverse and a longitudinal component, and are presented
as a function of K^2. The intercept $\alpha(0)$ -- 1 governing the energy
dependence of the vector meson cross sections is compared with the $\lambda$
parameter measured in inclusive F_2 analysis. For $\rho$ meson production, the
helicity amplitude ratios $|T_{ij}|/|T_{00}|$, extracted from the H1 and ZEUS
measurements of the spin density matrix elements are presented as a function of
Q^2 and W and are compared to recent predictions.
