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\section{Step 1: Network regions}  \subsection{1.a. Reading \subsection{Reading  principle} In most networks, the spatialization reveals regions in which numerous nodes are assembled and regions that are empty or almost. These differences of densities, determined by the uneven distribution of the connectivity in the network, are revealed by the force-vector algorithm like different light exposure are revealed by chemical agents in photography. Spatialization generates visual patterns that translate the mathematical properties of the network.