Highcharts.stockChart('container', {
    title: {
        text: 'yAxis: {min: 0.6, max: 0.9}'
    },
    rangeSelector: {
        selected: 1
    },

    yAxis: {
        min: 0.6,
        max: 0.9,
        startOnTick: false,
        endOnTick: false
    },

    series: [{
        name: 'USD to EUR',
        data: usdeur
    }]
});