Figure 7 | Scientific Reports

Figure 7

From: The evolution of interdisciplinarity in physics research

Figure 7

Evolution of the ks-shell indices of the PACS codes and the flows between ks-shell regions between the years 1987, 1997 and 2007.

The PACS codes for each year are divided into four different categories according to their k-shell index (indicated by the color). The size of the block indicates the number of codes in that category and the widths of the shaded areas correspond to the fraction of migrating codes. The green lines show ks-shell trajectories for some specific PACS codes as examples.

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