  In a follow-up study to a previous analysis of the IRAS 1.2Jy catalogue, we
quantify the morphological fluctuations in the PSCz survey. We use a variety of
measures, among them the family of scalar Minkowski functionals. We confirm the
existence of significant fluctuations that are discernible in volume-limited
samples out to 200Mpc/h. In contrast to earlier findings, comparisons with
cosmological N-body simulations reveal that the observed fluctuations roughly
agree with the cosmic variance found in corresponding mock samples. While
two-point measures, e.g. the variance of count-in-cells, fluctuate only mildly,
the fluctuations in the morphology on large scales indicate the presence of
coherent structures that are at least as large as the sample.
