Public data release accompanying the paper "Observation of inclination-dependent ringdown frequency shifts in 33 binary black hole mergers: Evidence for the Semi-Dirac membrane paradigm" (Frederick Manfredi, 2025). This dataset contains: • master_data.json – processed table of 33 real LIGO/Virgo/KAGRA binary black hole events (O1–O4) with official inclination posteriors, masses, network SNR, and the predicted Semi-Dirac frequency shift δf = +0.06 × f_ISCO × sin⁴ι • Extraction script (gwtc_real_inclination.py) that reads all public GWTC-1/2.1/3/4 .h5/.hdf5 files using PESummary • Plotting script (SEMI_DIRAC_final.py) reproducing the 4.4 σ result • Final figure (SemiDirac_33_events.png) The code automatically handles new public posterior files and incrementally updates the master table. All gravitational-wave samples are publicly available from GWOSC and the cited Zenodo records (GWTC-1, GWTC-2.1, GWTC-3, GWTC-4). License: CC-BY-4.0 Please cite this Zenodo record and the accompanying paper when reusing the data or code.