Pancake formation if Gaussian random perturbations are taken into account for the initial density field according to the cosmological perturbation power spectrum. The resulting density (left) and temperature (right) profiles are shown at z = 0 for an initial perturbation at L = 8 Mpc. The included upper scale length for the Gaussian random perturbations as fraction of L decreases from top to bottom: First row: 1/8 L; Second row: 1/4 L; Third row: 1/2 L. The obtained profiles are compared with the single-mode consideration given in Fig. 2. The latter is shown in gray.