.neigh files

Blank lines and comments prefixed by `#' may be placed anywhere. Triangles are numbered consecutively, starting from one or zero. Neighbors are indices into the corresponding .ele file. An index of -1 indicates no neighbor (because the triangle is on an exterior boundary). The first neighbor of triangle i is opposite the first corner of triangle i, and so on.

Triangle can produce .neigh files (use the -n switch), but cannot read them.

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