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#### 9.9 DCT Coefficient Probability Update {#h-09-09}
Contains updates to the probability tables used to decode DCT coefficients. For each of the probabilities in the tables, there is an L(1) flag indicating if the probability is updated for the current frame, and if the L(1) is 1, there follows an additional 8 bit value representing the new probability value. These tables are maintained across interframes but are of course replaced with their defaults at the beginning of every key frame.
The layout and semantics of this field will be taken up in Chapter 13.