line_chart={
const figure=html`<div id='line' style='width:600px; height:650px;'>`;
const a=randi(5,25),b=randi(8,48);
Highcharts.chart(figure, {
chart:{type:'line',backgroundColor:'whitesmoke'},
xAxis:{title:{text:'x'}},yAxis:{title:{text:'y'}},
title:{text:'a,b,n =>>> '+[a,b,n]},
credits:{enabled:false},legend:{enabled:false},
plotOptions:{series:{lineWidth:10}},
series:make_data(n,a,b)});
return figure;}