anchor.diff:      stacked: true,
       bars: 'vertical', // Required for Material Bar Charts.
       height: 150,
  -    series: [ {color: '#f46d43'}, {color: '#66c2a5'} ],
  +    series: { 0: {color: '#f46d43'}, 1: {color: '#66c2a5'} },
       legend: { position: "none" },
       bar: { groupWidth: "100%" },
       backgroundColor: "transparent",
  
positive.code:     stacked: true,
      bars: 'vertical', // Required for Material Bar Charts.
      height: 150,
      series: [ {color: '#f46d43'}, {color: '#66c2a5'} ],
      legend: { position: "none" },
      bar: { groupWidth: "100%" },
      backgroundColor: "transparent",
  
negative.code:     stacked: true,
      bars: 'vertical', // Required for Material Bar Charts.
      height: 150,
      series: { 0: {color: '#f46d43'}, 1: {color: '#66c2a5'} },
      legend: { position: "none" },
      bar: { groupWidth: "100%" },
      backgroundColor: "transparent",
  