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Global environmental effects versus galaxy interactions

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Figure 1. Colour distributions of close galaxy pairs (solid lines) and of CS4 (dashed lines), at low (upper panel), intermediate (middle panel) and high (lower panel) density environments.
Figure 2. Concentration index (C = r90/r50) distributions of close galaxy pairs (solid lines) and of CS4 (dashed lines), for low (upper panel),  in-termediate (middle panel) and high (lower panel) density environments.
Table 2. Percentages of red galaxies, (u − r) > 2.5, at low-, intermediate- intermediate-and high-local-density environments, hosted by small, medium intermediate-and large halo masses (see Table 1 for descriptions)
Figure 5. Scatter plot of colour and concentration index for close galaxy pairs (blue small dots) and merging systems (green asterisks) at low (upper panel), intermediate (middle panel) and high (lower panel) density  environ-ments (see Table 1)
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