Dataset for "A NICER View of PSR J0030+0451: Updated Constraints from Six Years of NICER Observations"

README====== Data for: A NICER View of PSR J0030+0451: Updated Constraints from Six Years of NICER ObservationsKini et al. (2026) -- Submitted to The Astrophysical Journal SOFTWARE-------- All inference runs were performed using X-PSI version 3.1.0.All post-processing was performed using X-PSI version 3.1.6. To exactly reproduce Figure 3, replace the file xpsi/PostProcessing/_corner.pyin your X-PSI installation with the _corner.py file provided in Files/ beforerunning the corresponding notebook. The notebooks should run without any modifications. HOTSPOT NAMING CONVENTION-------------------------- Throughout the paper (Tables 1 and 2, Figure 3), we adopt a consistenttransformed hotspot representation in which the hot region with the smallercolatitude is labeled as the secondary component, with correspondingtransformations applied to the superseding/ceding labels and phases. Note that the inference itself was performed in the native X-PSIparameterization, in which the hot region with the smaller colatitude is labeledas the primary component. The MultiNest output files in the Outputs/ folder aretherefore in the native parameterization. Users who require the maximum aposteriori (MAP) or maximum-likelihood (ML) parameter vectors in the nativeX-PSI parameterization should retrieve them directly from those MultiNestoutput files. REPOSITORY STRUCTURE--------------------- 1. mass_radius_contours/ Mass-radius posterior samples and credible contours for the PDT-U model. weighted_samples_PDTU.txt Column 0 -- Sample weight Column 1 -- Mass [M_sun] Column 2 -- Radius [km] equal_weight_samples_PDTU.txt Column 0 -- Mass [M_sun] Column 1 -- Radius [km] contours_PDTU_MR_68.txt Column 0 -- Radius [km] Column 1 -- Mass [M_sun] (68% credible contour) contours_PDTU_MR_95.txt Column 0 -- Radius [km] Column 1 -- Mass [M_sun] (95% credible contour) contours_PDTU_MR_99.txt Column 0 -- Radius [km] Column 1 -- Mass [M_sun] (99% credible contour) 2. Files/ Files/Figures/ Jupyter notebooks used to produce all figures in the paper. Notebook names are self-explanatory and correspond to the figures they generate. All notebooks should run without modification. Files/J0030_products/ Reduced observational data products. NICER: Event file: NICER/merged_cut.evt ARF: NICER/merged_cutmpu7.arf RMF: NICER/merged_cutmpu7.rmf V24 dataset (required to reproduce Figure 1): NICER_J0030_evt_30to299_exposure1936864_preprocessed_v006.txt XMM-Newton (MOS1 and MOS2): Spectra: XMM/MOS{1,2}/j0030_merged_spec_mos{1,2}.txt Response matrices: XMM/MOS{1,2}/j0030_merged_resp_uncomp_mos{1,2}.txt Background files: XMM/MOS{1,2}/j0030_merged_bkg_mos{1,2}.txt Channel-to-energy mapping (shared): XMM/j0030_merged_channel-energy_mapping_mos12.txt 3. STPDT_modules/ and PDTU_modules/ Python modules used for both inference and post-processing, for the ST+PDT and PDT-U models respectively. These include the CustomPrior classes and the transformed prior definitions used to swap hot region labels during plotting (see hotspot naming convention above). 4. Outputs/ MultiNest output files for all runs presented in the paper, organized by model (PDT-U and ST+PDT). Also includes the MultiNest outputs from V24 (see also :https://doi.org/10.5281/zenodo.8239000) to make the repository fully self-contained. 5. Model_data/ Atmosphere and interstellar absorption tables required to run X-PSI. model_data/nsx_H_v200804.out NSX fully-ionized, non-magnetic hydrogen atmosphere emergent intensity table (Ho & Lai 2001; Ho & Heinke 2009). This file was previously distributed in the earlier Zenodo release (https://doi.org/10.5281/zenodo.4697625), which included W. C. G. Ho as co-author. model_data/interstellar_phot_frac.txt Interstellar attenuation fraction table at a fiducial column density. 6. mass_radius_contours_old/ Mass-radius credible contours for the comparison sources used in Figure 4. PSR J0740+6620 -- Salmi et al. (2024) PSR J0030+0451 -- Vinciguerra et al. (2024) (V24) PSR J0437-4715 -- Choudhury et al. (2024) PSR J0614-3329 -- Mauviard et al. (2025) REFERENCES---------- Ho, W. C. G., & Lai, D. 2001, MNRAS, 327, 1081Ho, W. C. G., & Heinke, C. O. 2009, Nature, 462, 71Vinciguerra, S., Salmi, T., Watts, A. L., et al. 2024, ApJ, 961, 62Choudhury, D., Salmi, T., Vinciguerra, S., et al. 2024, ApJL, 971, L20Salmi, T., Choudhury, D., Kini, Y., et al. 2024, ApJ, 974, 294Mauviard, L., Guillot, S., Salmi, T., et al. 2025, ApJ, 995, 60Riley, T. E., Choudhury, D., Salmi, T., et al. 2023, JOSS, 8, 4977