Radial-velocity data and model fits for µ Her Aa. Top: radial velocities versus time. The points are coloured by instrument (see legend). Note that SONG RVs are nightly medians. Green curves represent random draws from the posterior of the RV-only solution, while black curves depict the joint solution; the median joint model is overlaid in white. The dashed lines trace the long-term trends: the green line indicates the best-fitting linear trend for the RV-only solution, while the black line follows the reflex motion induced by the A–BC orbit in the joint fit. Middle: residuals relative to the median joint model. The error bars include jitter. Bottom: residuals in three-year segments. To visualise the dense time series, residuals are displayed in three-year segments, starting from the year indicated on the left side of the plot and vertically offset by 40 ms⁻¹.