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| A study of a detector array designed to measure horizontal $\tau$ air-showers emerging from the ground, produced by $\nu_{\tau}$ interactions with the Earth's crust, is presented. Each array unit is composed of a pair of scintillator tiles mounted on a frame with a front field of view of about 0.1$~sr$, optimized to distinguish between up-going and down-going crossing particles by their time of flight. Preliminary test reults are shown. The detector array sensitivity, the size of the array and the $\tau$ shower identification are discussed. |