BKT-37C is a standalone technical annex to BKT-37, developing six numerical examples of applying the projection apparatus of the Universal Structural Code to residuals left by the adopted QCD/SM/EW null model. The analysis covers observables denoted M10, M14, M16, M2, M18, and M22. The purpose of the annex is to formally examine whether selected multi-bin structures can be described as cases of residual non-closure that, after subtraction of the null model, undergo measurable reduction within the USC projection apparatus. The document introduces an explicit notation register, epistemic statuses of quantities, the definition of the null model, the definition of the orthogonal residual, residual-reduction measures, comparison through (²), (), approximate (B), the reduction coefficient (ₑ₄₃), and a PASS/FAIL classification procedure. As a result, the annex does not remain at the level of qualitative interpretation, but presents a reproducible testing path: input data, null model, residual, USC projection, reduction, information penalty, limitations, and conditions for further validation. The presented results are not formulated as confirmation of a global discovery of new physics. Their status is more precise: they document a formally specified, dated, and numerically reproducible research path that may indicate a candidate relational-informational layer revealed in residuals left by the standard sectoral description. Full physical interpretation requires further block-level testing, out-of-sample validation, covariance control, and independent replication on experimental data. The package contains the Polish version, a full English mirror, LaTeX sources, PDF files, CSV data, and a reproduction script enabling the reconstruction of the basic numerical quantities used in the annex.
Robert Kupski (Sun,) studied this question.