We tested the new new flange using the same setup as in ELOG entry 14. The noise level seemed to be somewhere between the middle flange and the old flange.
See attachments:
1. Best noise conditions (grounding two planes and connection to ESR) on worst n-side pad.
2. Worse noise conditions (no grounding) on worst n-side.
3. Best noise conditions on a better n-side. We were unsure why some n-sides were different though.

Thus, for a final comparison of the flanges (best conditions on n-sides):
 - 2016 flange - noise scale = ~5V
 - 2022 flange - noise scale = ~0.4V
 - 2023 flange - noise scale = ~0.8V