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[kxyhu@yahoo.com.cn]

Hello,

During I calculate the total energy of the distorted system ,namely the atoms 
depart from their balanceable positions . the magnitude
of the distortion is equal,the sign is oppositional.The total energy of the 
plus distortion is equal to the total energy of the minus distortion.
Is the result  correct? I think there should be small difference .

Thank you,
hu