It is possible to print two or more matrices simultaneously by a set of multiple lines for each matrix row. For example the first row prints cell elements in the internal matrix, the second could print cell elements for the first (selected) input .ufm matrix file, etc. etc.
Similarly with stacked matrices the different “levels” may be displayed “interleaved” as above, as opposed to having the top level displayed first with lower levels beneath it. Alternatively a single level of a stacked matrix may be selected for display only.