  We show that s-convergence of graph sequences is equivalent to the
convergence of certain compact sets, called shapes, of Borel probability
measures. This result is analogous to the characterization of graphon
convergence (with respect to the cut distance) by the convergence of envelopes,
due to Dole\v{z}al, Greb\'{i}k, Hladk\'{y}, Rocha, and Rozho\v{v}.
