Where did the companion mountain to Arsai Mons go?

Left: Viking Orbiter Mosaic, 1976 Right: Resent Mars Map
NSSDC Image Catalog
Original Image was located:
http://daac.gsfc.nasa.gov/DAAC_DOCS/.../PlateP-7.jpeg
or http://daac.gsfc.nasa.gov/DAAC_DOCS/...PLATE_P-7.HTML


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