Reproducibility of susceptibility (expressed in units of parts per billion or ppb) for a single subject at multiple sites for A) the standard resolution protocol and B) the high resolution protocol. The analysed regions of interest are: Caudate Nucleus (CN), Putamen (P), Globus Pallidus (GP), Thalamus (T), Substantia Nigra (SN), Red Nucleus (RN), Dentate Nucleus (DN), Posterior limb of Internal Capsule (PIC), and Splenium of Corpus Callosum (SCC). Both left (L) and right (R) values are shown where appropriate.