var options = { diff: { innerCircle: { radiusFactor: 0.3 } } };

var options = { diff: { innerCircle: {borderFactor: 0.08 } } };

var options = { diff: { oldData: { opacity: 0.15 } } };

var options = { diff: { newData: { opacity: 0.8 } } };

var options = { diff: { oldData: { inCenter: false } } }；