Probably a strong Grease Fill on the devices. Note how on 'ICA' is showing an enlarging of those devices. Probably a fresh event that happened, and later on relocated on the deeper devices. It would be impossible to totally remove the tops of the devices by die polishing. It would tail off and not be so sharp of an edge. on a polishing. Although they did isolated polishing on one are, not the '9' is a slight bit smaller than the last two digits. Note on Liberty, how the devices get stronger to the left, and the polished devices on the right are reduced. So I feel this is not a die polishing issue. The difference happens to quickly to be a polishing issue.
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