Calculated rotation parameters of NGC 104. Left panel: the position angle of the rotation axis (θ₀) of NGC 104 is shown as a cyan circle with associated uncertainty, at the average projected distance of the velocity catalogues (r = 751 arcsec). In grey is the photometric major axis of the cluster derived in this work, with the uncertainty shown by the spread of the line. Middle panel: the inclination angle is shown in magenta, with associated uncertainty shown by the width of the line. An inclination angle of i = 0° indicates the cluster is face-on with respect to the observer, while i = 90° indicates an edge-on orientation. The length of the inclination angle line corresponds to the total rotational amplitude of the cluster (Atotal), shown on the x-axis. Right panel: the probability distribution of the total rotational amplitudes calculated for each MCMC sample.