The data structures associated with an ICE grid file MIGHT include: Counting: 1) NODE_NUM, the number of nodes; 2) EDGE_NUM, the number of edges, formed from pairs of nodes. 3) FACE_NUM, the number of faces, formed from triples of edges. 4) VOLUME_NUM, the number of volumes, formed from quads of faces. Location: 1) XYZ(3,NODE_NUM), the coordinates of each node Connectivity: 1) EDGE_NODE(2,EDGE_NUM), the pair of nodes forming each edge; 2) FACE_EDGE(3,FACE_NUM), the triple of edges forming each face; 3) VOLUME_FACE(4,VOLUME_NUM), the quad of faces forming each volume. Associated Data: Boundary information? MESH FILES: Spatial dimension Number of vertices vertex coordinates number of tetrahedra