title: Changing the y-axis scale in nvd3
body: <p>I am very new to nvd3. <strong>I plot a line chart, where most of the points are in the the Y-axis range 99 to 101. Only a few value will be outside this range.</strong> Check this image:</p>
  
  <p><img src="https://i.stack.imgur.com/zUMLf.png" alt="enter image description here"></p>
  
  <p><strong>I want this range to be enlarged all the time. I want end users to focus on the range from 99 to 101, regardless of a big or small values as outliers. Basically, the focus should be on the range from 99 to 101, but the other datapoints should also be displayed.</strong></p>
  
  <p>This is my current code:</p>
  
  <pre><code>$scope.setChartType = function(type) {
        console.log(type);
        $scope.options.chart.type = type;
      };
      $scope.options = {
        chart: {
          type: 'lineChart',
          height: ClickHandlerService.chartOptions.height,
          margin: ClickHandlerService.chartOptions.margin,
          x: function (d) {
            return parseInt(d.timestamp);
          },
          y: function (d) {
            return d.latency;
          },
          useInteractiveGuideline: true,
          staggerLabels: true,
          stacked: false,
  
          transitionDuration: ClickHandlerService.chartOptions.transitionDuration,
          transitionEase: ClickHandlerService.chartOptions.transitionEase,
          dispatch: {
            stateChange: function (e) { /*Placeholder for graph events*/
            },
            changeState: function (e) { /*Placeholder for graph events*/
            },
            tooltipShow: function (e) { /*Placeholder for graph events*/
            },
            tooltipHide: function (e) { /*Placeholder for graph events*/
            }
          },
          xAxis: {
            tickFormat: function (d) {
              return moment(d * 1000).utcOffset(-8).add(1, 'hours').format('DD-MM-YYYY/HH');
            },
            showMaxMin: false
          },
          yAxis: {
            axisLabel: 'Data Latency (In minutes)',
            tickFormat: function (d) {
              return d3.format('.02f')(d);
            },
            axisLabelDistance: 30,
            showMaxMin: false
          },
          callback: function (chart) {
          }
        },
        title: {
          enable: true,
          text: graphDetails.name
        },
        caption: {
          enable: true,
          html: ClickHandlerService.chartOptions.dataLatencyCaption,
          css: ClickHandlerService.chartOptions.captionCss
        }
      }; 
  </code></pre>