Supplementary data products for: "A NICER view of the millisecond pulsar PSR J2124-3358: evidence for a helium atmosphere"

Here we provide the supplementary data products associated with the manuscript "A NICER view of the millisecond pulsar PSR J2124-3358: evidence for a helium atmosphere" by González-Caniulef et al. (2026). The files include the corner plots for all atmosphere and hot spot models considered, pulse profile and residual plots, and the mass–radius credible region contours for the preferred ST+CDT helium atmosphere model. The complete set of files required to reproduce the analysis will be made available upon acceptance of the manuscript.