In the legends to the Figures 3 and 4 the sweep rates and temperatures have been transposed. The correct values are as follows: Figure 3: sweep rate 0.001 Ts À1 and T = 0.04-0.5 K; Figure 4: sweep rate 0.007 Ts À1 and T = 0.01-0.5 K. The authors apologize for the error.

We report on the Fe 17 high-spin molecular cluster and show that this system is an exemplification of nanostructured dipolar magnetism. Each Fe 17 molecule, with spin S 35=2 and axial anisotropy as small as D ' ÿ0:02 K, is the magnetic unit that can be chemically arranged in different packing crystals while preserving both the spin ground state and anisotropy. For every configuration, molecular spins are correlated only by dipolar interactions. The ensuing interplay between dipolar energy and anisotropy gives rise to macroscopic behaviors ranging from superparamagnetism to long-range magnetic order at temperatures below 1 K.

In den Bildunterschriften zu Figure Die Autoren entschuldigen sich für dieses Versehen.

In the legends to the Figures The authors apologize for the error.

In den Bildunterschriften zu Figure Die Autoren entschuldigen sich für dieses Versehen.