Meso Atoms: Definition and Phthalocyanine Examples

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CrimpJiggler
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What is a "meso atom"?

The class of compound I'm reading about is phthalocyanine:
c1ab2fca0949775a2df8b02f40060df0.png

The article mentions "meso atoms" on the phthalocyanine molecule. What is a meso atom, and which of phthalocyanines atoms would be considered meso atoms?
 
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I would imagine the 'naming' of the carbons/atoms follows that of porphyrin.

http://llg.chem.uni.wroc.pl/?Molecules:Porphyrin_Primer:Basics
 
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