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gtil = amp*(exp(-((etagrd(i) - eta0)**2/sigma**2)) + exp(-((etagrd(i) + eta0
& )**2/sigma**2)))
dngtil = amp*((-2.00000000000000d0*(etagrd(i) - eta0)*exp(-((etagrd(i) - eta
& 0)**2/sigma**2)))/sigma**2 - (2.00000000000000d0*(etagrd(i) + eta0)*ex
& p(-((etagrd(i) + eta0)**2/sigma**2)))/sigma**2)
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