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What are those and what do they do? Are they some kind of screen or port?
I noticed that all the standard NGE Evas have them, 00-04. The MP Evas have a half-black/half white circle there. One of the Chronicle drawings of Unit 01 has "Eva 01 Test Type" written in there on both sides, but I can't recall ever seeing that in the show.
Most of the new Rebuild Evas don't have them either. Mark.06 does. Unit 05 doesn't, Mark.09 doesn't, Units 02 and 08 don't have them in their upgraded configurations. Unit 13 has big gaps in its armor there and that's where Mari digs out the handle for the ejection system:
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Any ideas?