ALG-490, Two Level Arch I, Ti-Spad Area. Two openings with 3.1 meter span (shown in photo, on the right) and 6.2 meter span (not shown in photo). Both spans were measured. This double arch is located very close to ALG-489 (Nook Arch), which is the large opening shown in the left side of the photo. This photo shows only the smallest opening of the double arch on the right side of the photo. For the larger opening, see ALG-491.

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