code: function slide7() {
  		var slide = pptx.addNewSlide();
  		slide.addNotes('API Docs: https://gitbrent.github.io/PptxGenJS/docs/api-charts.html');
  		slide.addTable( [ [{ text:'Tornado Chart - Grid and Axis Formatting', options:gOptsTextL },gOptsTextR] ], gOptsTabOpts );
  
  		slide.addChart(
  			pptx.charts.BAR,
  			[
  				{
  					name: 'High',
  					labels: ['London', 'Munich', 'Tokyo'],
  					values: [.20, .32, .41]
  				},
  				{
  					name: 'Low',
  					labels: ['London', 'Munich', 'Tokyo'],
  					values: [-0.11, -0.22, -0.29]
  				}
  			],
  			{
  				x:0.5, y:0.5, w:'90%', h:'90%',
  				valAxisMaxVal: 1,
  				barDir: 'bar',
  				axisLabelFormatCode: '#%',
  				gridLineColor: 'D8D8D8',
  				axisLineColor: 'D8D8D8',
  				catAxisLineShow: false,
  				valAxisLineShow: false,
  				barGrouping: 'stacked',
  				catAxisLabelPos: 'low',
  				valueBarColors: true,
  				shadow: 'none',
  				chartColors: ['0077BF','4E9D2D','ECAA00','5FC4E3','DE4216','154384','7D666A','A3C961','EF907B','9BA0A3'],
  				invertedColors: ['0065A2','428526','C99100','51A7C1','BD3813','123970','6A575A','8BAB52','CB7A69','84888B'],
  				barGapWidthPct: 25,
  				valAxisMajorUnit: 0.2
  			}
  		);
  	}
docs: SLIDE 7: Tornado Chart --------------------------------------------------------------