*HEADING
  POST OUTPUT 
  UNIAXIAL STRETCHING OF A RUBBER SHEET W/ CIRCULAR HOLE - PLANE STRESS 
  BIDERMAN STRAIN ENERGY FUNCTION
*POST OUTPUT,STEP=1
7, 
*EL PRINT,ELSET=TOPE
DG,DGP
*EL FILE,ELSET=TOPE
DG,DGP