Pilot dataset v3: High-frequency QPO pairs in stellar-mass black holes (9 sources, extended sample)

This pilot dataset (v3) builds on versions v1 (synthetic data only) and v2 (real HFQPO pairs, 7 sources). Version 3 integrates two additional sources (4U 1630–47, GX 339–4), yielding 9 black hole binaries, 6 HFQPO pairs, and 4 with published dynamical masses. The accompanying files include: CSV dataset (v3) Python scripts for analysis and visualization Figures (scatter and log–log scaling) Short note (2-page PDF) summarizing results and DOI references The aim is to provide a transparent preregistration of the methodology and preliminary results. Future releases (≥v4) will expand the sample with ≥10 sources with robust mass constraints, to test the predicted ~1/M scaling of HFQPO frequencies.