V3: Line with different bullet sizes

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/serial.js"></script>
<div id="otra" style="width: 100%; height: 102px; background: #615f5f;"></div>
<div id="chartdiv" style="width: 100%; height: 362px; background-color:#161616""></div>

JavaScript

// note, we have townName field with a name specified for each datapoint and townName2 with only some of the names specified.
// we use townName2 to display town names next to the bullet. And as these names would overlap if displayed next to each bullet,
// we created this townName2 field and set only some of the names for this purpse. 
var chartData = [{
    "date": "2012-01-01",
        "distance": 227,
        "townName": "New York",
        "townName2": "New York",
        "townSize": 25,
        "latitude": 40.71,
        "duration": 408
}, {
    "date": "2012-01-02",
        "distance": 371,
        "townName": "Washington",
        "townSize": 14,
        "latitude": 38.89,
        "duration": 482
}, {
    "date": "2012-01-03",
        "distance": 433,
        "townName": "Wilmington",
        "townSize": 6,
        "latitude": 34.22,
        "duration": 562
}, {
    "date": "2012-01-04",
        "distance": 345,
        "townName": "Jacksonville",
        "townSize": 7,
        "latitude": 30.35,
        "duration": 379
}, {
    "date": "2012-01-05",
        "distance": 480,
        "townName": "Miami",
        "townName2": "Miami",
        "townSize": 10,
        "latitude": 25.83,
        "duration": 501
}, {
    "date": "2012-01-06",
        "distance": 386,
        "townName": "Tallahassee",
        "townSize": 7,
        "latitude": 30.46,
        "duration": 443
}, {
    "date": "2012-01-07",
        "distance": 348,
        "townName": "New Orleans",
        "townSize": 10,
        "latitude": 29.94,
        "duration": 405
}, {
    "date": "2012-01-08",
        "distance": 238,
        "townName": "Houston",
        "townName2": "Houston",
        "townSize": 16,
        "latitude": 29.76,
        "duration": 309
}, {
    "date": "2012-01-09",
        "distance": 218,
        "townName": "Dalas",
        "townSize": 17,
        "latitude": 32.8,
        "duration": 287
}, {
    "date": "2012-01-10",
        "distance": 349,
        "townName":...