         {
                    name: "CTCF - string url",
                    type: "wig",
                    format: "bigwig",
                    url: "https://www.encodeproject.org/files/ENCFF563PAW/@@download/ENCFF563PAW.bigWig"
                },
                {
                    name: "CTCF - function url ",
                    type: "wig",
                    format: "bigwig",
                    url: function () {
                        return "https://www.encodeproject.org/files/ENCFF563PAW/@