Example: External potential at nuclei
*************************************

"Download SP_extpotential.run"

   #!/bin/sh

   $AMSBIN/ams << eor

   Task SinglePoint

   Properties
      Gradients True
   End

   System
       Atoms
         H  0.0   0.0  0.0   DFTB.Vext=-0.01
         H  0.75  0.0  0.0   DFTB.Vext=0.01
       End
   End

   Engine DFTB
       Model SCC-DFTB
       ResourcesDir DFTB.org/mio-1-1
   EndEngine

   eor

