Fig. 5
Fraction of red, passive galaxies, fred, as a function of group richness 
for principal (dots) and companion (triangles) galaxies. The lines are the best linear least-squares fit to the principal (solid) and companion (dashed) data. The dashed areas show the 68% confidence intervals of fred for principal (right-dashed) and companion (left-dashed) galaxies outside groups.
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