Fig. 12
The IRAC color–colors plot, originally presented in Fig. 7. Blue circles indicate the spiral galaxies of our HCG sample, blue squares are the irregulars, red triangles are the elliptical galaxies, and red diamonds the lenticular ones. Green dots indicate the LVL galaxies. According to Johnson et al. (2007) the “gap” is located in the area enclosed by the dashed lines.
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