r FAPs. The FIG is a graph with nodes and directed links. Each node contains a set of FAPs. Each link from a parent node to a child node indicates that the FAPs in a child node can be interpolated from those of the parent node. In a FIG, a FAP may appear in several nodes, and a node may have multiple parents. For a node that has multiple parent nodes, the parent nodes are ordered as 1st parent node, 2nd parent node, etc. During the interpolation process, if this child node needs to be interpolated, it is first interpolated from the 1st parent node if all FAPs in that parent node are available. Otherwise, it is interpolated from the 2nd parent node, and so on. An example of FIG is shown in Fig. 12. Each node has an ID. The numerical label on each ing link indicates the order of these links.
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