es to set up dynamic colors
        // 1) arrays of distinct values
        let distinctPorts = [];
        let distinctorg = [];
        let distinctCities = [];
        let distinctCountries = [];


        for (let i = 0; i < graph.nodes.length; i++) {
            distinctPorts.push(graph.nodes[i].port);
            distinctorg.push(graph.nodes[i].org);
            distinctCities.push(graph.nodes[i].city);
            distinctCountries.push(graph.nodes[i].country);
        };

        distinctPorts = Arr