Velocity and velocity dispersion of the GC system. Monte Carlo Markov Chain results of fitting a maximum likelihood function to the velocities recovered for the 5 GCs around FCC 224 with the highest S/N to recover the velocity dispersion and recessional velocity of the host galaxy. The MCMC was run using a uniform prior, and returned $V=1403.8_{-7.6}^{+6.0}$ km s⁻¹ and a dispersion velocity of ${\sigma }_{\mathrm{GCs}}=12.{69}_{-6.49}^{+10.35}$ km s⁻¹. This velocity dispersion is considered an upper limit based on previous studies that shown that uniform priors tend to overestimate the velocity dispersion of galaxies when a small number of tracers is used.