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![Tattoo-like epidermal electronics as skin sensors for human-machine interfaces](https://image.oaes.cc/3ce45195-d0e1-45d4-a467-4e1b0a46c806/4320.fig.2.jpg)
Figure 2. Electrical characteristics of strain sensor. (A) Electrical signals (∆R/R0) of strain sensor at different longitudinal tensions. (B) Electrical signals (∆R/R0) of strain sensor at different transverse tensions. (C, D) Electrical signals (∆R/R0) of strain sensor at different frequencies under 12.5% strain and its detailed signals at 6 Hz. (E, F) Electrical signals (∆R/R0) of strain sensor in a fatigue test for 150 cycles and its detailed signals from a selected range.