# PAPER_1175 UPDATE — Kerr Ringdown R₂₆ Correction

**Original:** PAPER_1175 Kerr Ringdown UQFF Vacuum Impedance
**Update:** Session June 2026
**Status:** Update

## Session Extensions

R₂₆ ringdown correction confirmed in calculator with f_220 baseline 250.7 Hz at canonical reference mass. Multi-mode spectrum wired (see PAPER_1238) for f_221/f_220 = 0.9834 (0.86% residual) and f_330/f_220 = 1.575 (1.74% residual).
