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### Section 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.