Contour plot for the field of two Skyrmions that have collided. The broken contours imply conversion of the Skyrmions into Nielsen-Olesen strings.

From the article:

Intercommutation of Semilocal Strings and Skyrmions
Pablo Laguna, Vishnu Natchu, Richard A. Matzner, and Tanmay Vachaspati
Phys. Rev. Lett. 98, 041602 (2007)

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