gistfile1.txt

{
    "layers": {
        "countries": {
            "src": "ne_10m_admin_0_countries.shp"
        },
        "graticule": {
            "special": "graticule",
            "latitudes": "3",
            "longitudes": "3"
        }
    },
    "bounds": {
        "mode": "bbox",
        "data": [-180, -90, 180, 90]
    }
}