Example systems, methods, and apparatus associated with determining a phase-encoding direction for parallel MRI are described. ; allowing sweet water stream of step to separate into a top layer comprised of fat and a bottom layer comprised of glycerin and water while maintaining a temperature of the two layers of at least about 200\xb0 C. Accordingly, land and groove addresses can be detected by the same method, and the land track can be easily discriminated from a groove track by making the sizes of the addresses different in the land and groove tracks. 9, and consists of the substances Cr2O3 or Fe2O3 or a mixture containing these substances, with the portion of Fe2O3 amounting to at least 25% by weight in the mixture, and with the portion of Cr2O3 amounting to at least 20% by weight in the mixture. The housing also includes first, second, third and fourth termination legs.