Data-to-model ratio of the six NICER (0.3–10 keV) spectra with respect to the different adopted models, with or without the gabs component. The adopted colors for each spectrum are shown in the legend in which we indicate the last three digits of the corresponding observation ObsId. In the top panels we show the ratio corresponding to Model B, Model C, and Model D, respectively. In the bottom panels we show the ratio of the same models including a gabs component at 0.7 keV. The black horizontal lines indicate a deviation of the model from the data corresponding to 2%.