Fig. D.1.
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0.2−2 keV observed flux, FX against an estimate of the spectral hardness (log[A1/A2]) during the early time NICER observations presented in Fig. 4. When FX is higher, the spectrum becomes harder. The red markers denote observations obtained when the source exhibited large amplitude modulations during W1. A smaller log[A1/A2] value denotes a harder X-ray spectrum.
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