Rear view of the segmented SSD detector. The segments are arranged in a 3 × 5 array. The large (numbered) segments are 2 × 2 mm² in dimension while the smaller pixels (same pattern shifted rightwards when seen from behind) are 0.3 × 0.3 mm² in size. The central uppermost segment (#0) is for GCR background determination. The numbers are added to the photo to explain the pixel numbering. For incoming particles the pixel numbering appears mirrored along the central column, accordingly.