Table 2. The peak of synchronous and asynchronous two-dimensional correlation.

Peak	Horizontal axis/nm	Vertical axis/nm
Auto-correlation peak	537~560	537~560
Auto-correlation peak	708~719	708~719
positive cross peak	537~560	708~719
Cross peak	450~456	534~565
Cross peak	450~456	714~728
Cross peak	556~561	785~800
Cross peak	709~721	744~800