gcxgc_heatmap(GCxGC, metabolites,
    rt.width = "60,0.5",
    space = "5,5",
    size = "3600,2100",
    padding = "padding: 200px 600px 250px 250px;",
    colorSet = "viridis:turbo",
    mapLevels = 64,
    labelStyle = "font-style: normal; font-size: 16; font-family: Bookman Old Style;");