make_treeseq_svg = async () => {
await pyodide.loadPackage("msprime");
const msprime = await pyodide.pyimport("msprime");
const ts = msprime.sim_ancestry.callKwargs({samples: 5, recombination_rate: 1e-7, sequence_length:1e6, random_seed:6667, record_full_arg: true});
const ts_svg = ts.draw_svg.callKwargs({size: [600, 400]});
return html`${ts_svg}`
}