Supplementary data and code for response-symbol criteria for connected unstable-band structures in a fractional nonlocal Gross–Pitaevskii equation with quintic saturation

This record contains the supplementary data and Python scripts used to generate the main figures, numerical tables and reproducibility checks for the manuscript “Response-symbol criteria for connected unstable-band structures in a fractional nonlocal Gross–Pitaevskii equation with quintic saturation”, submitted to Nonlinear Analysis: Modelling and Control. The archive includes scripts for computing connected unstable-band structures, criterion-based transition diagrams, Gaussian baseline comparisons, broadband-only simulations, resolution checks, figure-generation files, CSV data files, requirements information and reproducibility notes. The data and code support reproducible checks of the transition diagram and broadband window-gap contrast. The archive contains no sensitive, proprietary or third-party restricted material.