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Center explosion, sarma absorbing boundary program。
Four sub-processes are using sarma absorbing boundary conditions, which 1. GAC.m added a transition zone, the left and right under the trilateral process 2. GAC2.m is not added to the transition zone, the left and right under the trilateral process 3. GAC3.m added a transition zone of the four sides are treated 4. GAC3.m is not added to the transition zone of the four sides are treated