#### Calibration of Euclidean Steiner Trees by Currents

#### in collaboration with A. Massaccesi and B. Velichkov

You can find illustrations of counter examples of calibration identification on the following link

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Representation of an optimal calibration associated to three equilateral points

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Representation of an optimal calibration associated to the four vertices of a square

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Representation of an optimal calibration associated to the five vertices of a Pentagon

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Representation of an optimal calibration associated to the six vertices of an Hexagon

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Representation of an optimal calibration associated to a configuration made of six points

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Representation of an optimal calibration associated to a regular polygon of 7 vertices