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Figure 1
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(a) Experimental setup: detection with a THz camera. L: plano-convex lens (f = 300 mm); M: off-axis parabolic mirror (f = 150 mm). Inset: picture of the plasma filament (the size of the square is 1 × 1 cm2). (b) Evolution of the THz beam along the Z-axis, as defined in (a).
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