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This is 2 matrices greater than the Tank's vision, so maximization of tank effectiveness requires a spotter, such as a Viking, Reaper or Xel'Naga Tower (or sacrificing Orbital Command energy for a Scanner Sweep).
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This damage decreases in a radius around the epicenter: units (whether hostile or friendly) within. In siege mode, Siege Tanks do 40 (+30 against armored) splash damage. They are also a reliable source of ground splash damage for Terrans. The Siege Tank is a powerful tool for securing specific tactically important areas of the map, but somewhat immobile compared to other Terran units such as the Marine and other biological units, particularly due to its transformation time. It is built from a Factory with an attached Tech Lab. Against masses of smaller units, the Siege Tank can switch to the stationary Siege Mode to deal splash damage from longer range. The long-ranged Siege Tank is a Mechanical unit with high damage, particularly versus Armored like Roaches and Stalkers.
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