5     'nports' = number of boundary port sections
   1     'kdport' = port orientation (1=N, 2=S, 3=E, 4=W)
  478    'ifport' = first i-index
 1134    'ilport' = last  i-index (=ifport for east/west port)
  633    'jfport' = first j-index
  633    'jlport' = last  j-index (=jfport for north/south port)
   2     'kdport' = port orientation (1=N, 2=S, 3=E, 4=W)
  607    'ifport' = first i-index
 1134    'ilport' = last  i-index (=ifport for east/west port)
   2     'jfport' = first j-index
   2     'jlport' = last  j-index (=jfport for north/south port)
   3     'kdport' = port orientation (1=N, 2=S, 3=E, 4=W)
 1135    'ifport' = first i-index
 1135    'ilport' = last  i-index (=ifport for east/west port)
   2     'jfport' = first j-index
  42     'jlport' = last  j-index (=jfport for north/south port)
   3     'kdport' = port orientation (1=N, 2=S, 3=E, 4=W)
 1135    'ifport' = first i-index
 1135    'ilport' = last  i-index (=ifport for east/west port)
  435    'jfport' = first j-index
  486    'jlport' = last  j-index (=jfport for north/south port)
   3     'kdport' = port orientation (1=N, 2=S, 3=E, 4=W)
 1135    'ifport' = first i-index
 1135    'ilport' = last  i-index (=ifport for east/west port)
  599    'jfport' = first j-index
  632    'jlport' = last  j-index (=jfport for north/south port)