', label:'Ad requests'},
            {calc:matchedAdReqToNumber, type:'number',
                label:'Matched ad requests'},
            {calc:indAdImpressionsToNumber, type:'number',
                label:'Individual ad impressions'},
          ]);
          drawVisualization(view);
        });

      });

    }

    // Converts the page views field to numberic values.
    function viewsToNumber(dataTable, rowNum){
      return parseInt(dataTable.getValue(rowNum, 1));
    }

    // Converts the ad request