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Caption: Figure 4.
Time series of relative FWHM measurements for all NETS stars with multiple nights of data collected prior to 2021 August. We observe a sharp decrease in FWHM in 2021 August for all solar-type stars, and we interpret this as a break in the RV time series necessitating the definition of a new NEID RV era prior to this date. A sharp FWHM change is also observed for HD 95735, an M dwarf, but this change does not follow that of the other stars, suggesting a chromatic dependence. Though the ΔFWHM time series for HD 170657 and HD 201091 stand out from the other solar-type stars, these variations reflect changing stellar activity levels rather than an instrumental effect.
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