In the following screendump, I used 6 sparkline fields:

To increase the width / height of the sparkline (bar) I set the following values:

– charArea options (height, padding, margin)

– Series options (gap and spacing)

$scope.kostenMinderPersoneelChartOptions = {
            chartArea: {
                background: "",
                height: 17,
                margin: {
                    top: 1,
                    bottom: 0,
                    left: 0,
                    right: 0
                },
                padding: 0
            },
            tooltip: {
                visible: false
            },
            series: [
                {
                    type: 'bar',
                    color: '#EC008C',
                    field: 'sparkline',
                    gap: 0,
                    spacing: 0
                }
            ],
            valueAxis: {
                min: 0,
                max: 200000
            }
        };