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### Chapter 17: Motion Vector Decoding {#h-17-00}
As discussed above, motion vectors appear in two places in the VP8 datastream: applied to whole macroblocks in `NEWMV` mode and applied to subsets of macroblocks in `NEW4x4` mode. The format of the vectors is identical in both cases.
Each vector has two pieces: A vertical component (row) followed by a horizontal component (column). The row and column use separate coding probabilities but are otherwise represented identically.