Background-subtracted X-ray spectrum from NICER. This is an example of a high-flux spectrum, taken from one 200 second exposure, used to estimate the spectral parameters. The spectrum is fit with a blackbody model. The residuals in the bottom panel show the presence of an additional component, corresponding to the emission and/or absorption feature around ∼1 keV, analyzed in detail in Chakraborty et al. (2025b).