Question: How to change tickmarks in sparsematrixplot?


Let's take the last example (Maple 2019) given in help[sparsematrixplot] (representation of the adjacency matrix of a graph).
Vertices of this graph are labelled 1, 2, ...20.
Suppose I change these names as a, b, ...t.
I would like the tickmarks of the sparsematrixplot output match the names of the vertices of the graph, and not the integers 1, 2, ..20

I tried this:
S := [$1..20] =~ StringTools:-Char~(96 +~  [$1..20]);
plots:-sparsematrixplot(..., tickmarks=[S, S])

But the only the tickmars of the columns are changed, not those of the rows.

Is it possible to change the names of the tickmarks ?

Thanks in advance.

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