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Fig. 5


Stellar-to-gas mass ratio within r500 vs. total mass (left panel) and iron abundance (right panel) and their best fits. The symbols have the same meaning as those in Fig. 1. These two correlations indicate that the iron in the ICM mainly comes from the pollution by the star formation that happened in the past. In less massive galaxy systems, the star formation efficiency is higher.

This figure is made of several images, please see below:

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