Stack Overflow: How to represent quantity in an X / Y axis grid without taking too much space?

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script nonce="undefined" src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <style>
    html,
    body,
    #myChart {
      height: 100%;
      width: 100%;
    }
  </style>
</head>

<body>
  <div id='myChart'></div>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"];
    var myConfig = {
      type: 'heatmap',
      title: {
        text: 'Symptoms to Display',
        fontFamily: 'Georgia'
      },
      plot: {
        aspect: 'size',
        tooltip: {
          text: '%t symptoms:<br>Ages %kl: %v',
          textAlpha: 1,
          fontColor: 'black',
          backgroundColor: 'white',
          borderWidth: 1,
          borderColor: 'gray',
          borderRadius: '3px',
          alpha: 0.7,
          padding: '10%'
        }
      },
      scaleX: {
        labels: ['13 & under', '13-17', '18-24', '25-34', '35-44', '45-54', '55+'],
        tick: {
          visible: false
        },
        guide: {
          visible: false
        }
      },
      scaleY: {
        tick: {
          visible: false
        },
        guide: {
          visible: false
        }
      },
      plotarea: {
        marginLeft: 'dynamic'
      },
      series: [{
          values: [59, 15, 5, 30, 60, 99, 28],
          text: 'Body Ache'
        },
        {
          values: [34, 32, 87, 65, 9, 17, 40],
          text: 'Cough'
        },
        {
          values: [90, 19, 50, 39, 12, 49, 14],
          text: 'Sore Throat'
        },
        {
          values: [59, 15, 5, 30, 60, 99, 28],
          text: 'Rash'
        },
        {
          values: [34, 32, 87, 65, 9, 17, 40],
          text: 'Nausea'
        },
        {
          values: [90, 19, 50, 39, 12, 49, 14],
          text: 'Headache'
        },
        {
          values: [59, 15, 5, 30, 60, 99, 28],
          text: 'Flu'
        },
        {
          values: [34, 32, 87, 65, 9, 17, 40],
          text: 'Cold'
        }
      ]
    };

    zingchart.render({
      id: 'myChart',
      data: myConfig,
      height: 400,
      width: 600
    });
  </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script src="https://cdn.zingchart.com/zingchart.min.js"></script>
</head>

<body>
  <div id='myChart'></div>
</body>

</html>

html,
body,
#myChart {
  height: 100%;
  width: 100%;
}

var myConfig = {
  type: 'heatmap',
  title: {
    text: 'Symptoms to Display',
    fontFamily: 'Georgia'
  },
  plot: {
    aspect: 'size',
    tooltip: {
      text: '%t symptoms:<br>Ages %kl: %v',
      textAlpha: 1,
      fontColor: 'black',
      backgroundColor: 'white',
      borderWidth: 1,
      borderColor: 'gray',
      borderRadius: '3px',
      alpha: 0.7,
      padding: '10%'
    }
  },
  scaleX: {
    labels: ['13 & under', '13-17', '18-24', '25-34', '35-44', '45-54', '55+'],
    tick: {
      visible: false
    },
    guide: {
      visible: false
    }
  },
  scaleY: {
    tick: {
      visible: false
    },
    guide: {
      visible: false
    }
  },
  plotarea: {
    marginLeft: 'dynamic'
  },
  series: [{
      values: [59, 15, 5, 30, 60, 99, 28],
      text: 'Body Ache'
    },
    {
      values: [34, 32, 87, 65, 9, 17, 40],
      text: 'Cough'
    },
    {
      values: [90, 19, 50, 39, 12, 49, 14],
      text: 'Sore Throat'
    },
    {
      values: [59, 15, 5, 30, 60, 99, 28],
      text: 'Rash'
    },
    {
      values: [34, 32, 87, 65, 9, 17, 40],
      text: 'Nausea'
    },
    {
      values: [90, 19, 50, 39, 12, 49, 14],
      text: 'Headache'
    },
    {
      values: [59, 15, 5, 30, 60, 99, 28],
      text: 'Flu'
    },
    {
      values: [34, 32, 87, 65, 9, 17, 40],
      text: 'Cold'
    }
  ]
};

zingchart.render({
  id: 'myChart',
  data: myConfig,
  height: 400,
  width: 600
});