I need to limit my returned rows from a JSON database to 50 rows but after a feverish night of trial and error I still can't work it out? Here's my JSONP request code. I tried the Sparkfun API Docs but they're quite limited and I couldn't work out how to use them in my code. <http://phant.io/api/metadata/> Any help would be appreciated?

```
// JSONP request
var jsonData = $.ajax({
    url: 'https://data.sparkfun.com/output/' + public_key + '.json',
        data: {page: 1},
        dataType: 'jsonp',
    }).done(function (results) {

        var data = new google.visualization.DataTable();

        data.addColumn('datetime', 'Time');
        data.addColumn('number', 'Baro');

        $.each(results, function (i, row) {
            data.addRow([
                (new Date(row.timestamp)),
                 parseFloat(row.Baro)
            ]);
        });

```