Jquery – How to hide the points that are displayed on the plot chart

I have the following jqPlot chart:

    $(document).ready(function () {
       var line1 = new Array();
       @foreach (var item in Model)
       {
          <text>line1.push(["@item.VisitDate.Value.ToString("dd-MMM-yyyy")", @item.count]);</text>
       }
       var plot1 = $.jqplot('chart1', [line1], { title: '<span style="Color: Green " >Number Of Visits</span>',
          axesDefaults: { pad: 1.2 },
          axes: { 
             xaxis: { 
                renderer: $.jqplot.DateAxisRenderer,
                tickOptions: {
                    formatString: '%d/%b/%Y'
                }
             },
             yaxis: { tickOptions: { formatString: '%.2f'} }
          },
          highlighter: { show: true, sizeAdjust: 7.5, tooltipLocation: 'nw'
                //            , formatString: '<b>%s</b>'
          }, cursor: { show: true, tooltipOffset: 6 }
      })    
   });

but I need to hide the Circular points that are currently displayed on the plot chart for each value in the array. In other words I need the jqPplot chart to show only a simple line without any circular points, highlighter or tickoptions, etc..