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Papers

Testing the Kerr Black Hole Hypothesis Using X-Ray Reflection Spectroscopy and a Thin Disk Model with Finite Thickness by Abdikamilov et al; we can compare Gradus results with these results using the transfer function and binned methods.
Photon rings as tests for alternative spherically symmetric geometries with thin accretion disks by Dias da Silva et al. (2023); could try implementing some of these new metrics in Gradus.
Active galactic nuclei with high-resolution X-ray spectroscopy by Gallo et al. (2023); could try simulating high resolution line profiles with Gradus.
Observational Constraints on Black Hole Spin by Reynolds (2021) - see Fig. 1 for a plot of the different orbital radii as a function of black hole spin.
Here's an interesting pre-print on the spin evolution of BHs in galaxies and what HEX-P can do in the future (if it is selected) - The High Energy X-ray Probe (HEX-P): Constraining Supermassive Black Hole Growth with Population Spin Measurements by Piotrowska and the HEX-P collaboration

Information for writing XRISM proposals which includes response matrices can be found here.

Investigate parameter degeneracies
Investigate changing multiple deformation parameters to expand the work of Abdikamalov (2020).