function increaseInterval(interval) {
        var exp10 = Math.pow(10, Math.floor(Math.log(interval) / Math.LN10));
        // Increase interval
        var f = interval / exp10;
        if (f === 2) {
            f = 5;
        }
        else { // f is 2 or 5
            f *= 2;
        }
        return f * exp10;
    }
Radar dimensions is based on the data
@type {Array}