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The matrix flag indicates that the ASCII data are stored in matrix format. The z-values are read in a row at a time, i. e.,
z11 z12 z13 z14 ... z21 z22 z23 z24 ... z31 z32 z33 z34 ...
and so forth. The row and column indices are used for the x- and y-values.
A blank line or comment line ends the matrix, and starts a new surface mesh. You can select among the meshes inside a file by the index option to the `splot` command, as usual.