This PDF file includes:

• Supplementary Discussion I: Terminology considerations
• Supplementary Discussion II: Minimal size of ESBs
• Fig. S1. Sketches of simulation supercell and skyrmion structures.
• Fig. S2. ESBs of different sizes and shapes.
• Fig. S3. Smallest ESB.
• Fig. S4. ESB as a four-state memory.
• References (36–38)

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