  The algorithm ZTRACE of Monaco & Efstathiou (1999) is applied to the IRAS
PSCz catalogue to reconstruct the initial conditions of our local Universe with
a resolution down to ~5 Mpc/h. The 1-point PDF of the reconstructed initial
conditions is consistent with the assumptions that (i) IRAS galaxies trace mass
on scales of ~5 Mpc/h, and (ii) the statistics of primordial density
fluctuations is Gaussian. We use simulated PSCz catalogues, constructed from
N-body simulations with Gaussian initial conditions, to show that local
non-linear bias can cause the recovered initial PDF (assuming no bias) to be
non-Gaussian. However, for plausible bias models, the distortions of the
recovered PDF would be difficult to detect using the volume finely sampled by
the PSCz catalogue. So, for Gaussian initial conditions, a range of bias models
remain compatible with our PSCz reconstruction results.
