PKS J0805–0111 light curves at 15 GHz, 95 GHz, 147 GHz, and 225 GHz. The main panel shows the time range covered by the ACT observations, while the inset shows the full range observed by OVRO. Heavy points are binned into 25-day intervals (100 days in the inset) to guide the eye, with individual measurements shown as lighter points; the sinusoidal least-squares fits were done on the unbinned data. A monotonic phase shift of the sine waves to earlier times with increasing frequency is visible by eye, and is reported relative to the OVRO phase as Δϕ₀ in Table 2. The dashed vertical line at MJD 59041 (2020 July 11) indicates the approximate date at which D25 found that the sinusoidal variation in the 15 GHz ceases. The ACT mm data also apparently flatten around the same time.