A receiving area, in particular each receiving area, can have a volume of between 10 and 3000 ??l, preferably of between 20 and 150 ??l; the height can be between 5 ??m and 10 mm, preferably between 0.1 mm and 0.5 mm, the width between 10 ??m and 40 mm, preferably between 1 and 10 mm.