@download/ENCFF563PAW.bigWig"
                    }
                },
                {
                    name: "CTCF - promise url",
                    type: "wig",
                    format: "bigwig",
                    url: Promise.resolve("https://www.encodeproject.org/files/ENCFF563PAW/@@download/ENCFF563PAW.bigWig")
                },
                {
                    name: "CTCF - function that returns promise url",
                    type: "wig",
                    format: "bigwig",
    