  This work describes the continuous-variable entanglement of the
counter-propagating twin beams generated in a Mirrorless Optical Parametric
Oscillator below threshold, encompassing both their quadrature and
photon-number correlation. In the first case, a comparison with the single-pass
co-propagating geometry outlines the huge difference of the bandwidth involved
and a completely different stability of the two sources with respect to the
phase-angle. In the second case, stimulated by the critical divergence of the
correlation time evidenced by Corti et al., we address the issue of the
temporal bandwidth of the intensity squeezing.
