nchmarks, in which case, we want to reduce our layout to
    // one column.
    let nonempty_kde = false;
    inputs.series.forEach(function (serie) {
	if ('kde' in serie) {
	    nonempty_kde = nonempty_kde || true;} });
    const nb_col = nonempty_kde ? 2 : 1;

    // ************************************************ //
    //              Layout of the page                  //
    // ************************************************ //
    // + a summarize bar graph on top
    // + one section for each benc