https://collaborate.princeton.edu/en/publications/twins-stereoscopic-imaging-of-multiple-peaks-in-the-ring-current/fingerprints/
TWINS stereoscopic imaging of multiple peaks in the ring current - Fingerprint - Princeton...
in the ringmultiple peaks
https://pure.psu.edu/en/publications/mpfit-a-robust-method-for-fitting-atomic-resolution-images-with-m/
mpfit: a robust method for fitting atomic resolution images with multiple Gaussian peaks - Penn...