The Neutron star Interior Composition Explorer (NICER) hardness-intensity diagram (HID) where the hardness ratio is defined as the count ratio of the hard band (4–12 keV) and the soft band (2–4 keV), and the count rate is in 0.4–12 keV and normalized for 50 FPMs. The gray points represent the NICER observations from 2018 March 6 to 2018 Oct 15, corresponding to obs.ID 1200120101 to 1200120278. Some points appear black because of several observations with very similar hardness and count rate overlapping. The “jet line” corresponds to the quasi-periodic oscillation (QPO) type transition and the observed strong radio flare (Homan et al. 2020).