--- manual/s_phys_pkgs/text/obcs.tex	2011/11/09 11:48:40	1.15
+++ manual/s_phys_pkgs/text/obcs.tex	2016/06/15 13:40:53	1.18
@@ -233,9 +233,9 @@
 and for each meridional position $j=1,\ldots,N_y$, a zonal index
 $i$ specifies the Eastern/Western OB position.
 For Northern/Southern OB this defines an $N_x$-dimensional
-``row'' array $\tt OB\_Jnorth(Ny)$ / $\tt OB\_Jsouth(Ny)$,
+``row'' array $\tt OB\_Jnorth(Nx)$ / $\tt OB\_Jsouth(Nx)$,
 and an $N_y$-dimenisonal 
-``column'' array $\tt OB\_Ieast(Nx)$ / $\tt OB\_Iwest(Nx)$.
+``column'' array $\tt OB\_Ieast(Ny)$ / $\tt OB\_Iwest(Ny)$.
 Positions determined in this way allows Northern/Southern
 OBs to be at variable $j$ (or $y$) positions, and Eastern/Western
 OBs at variable $i$ (or $x$) positions.
@@ -268,6 +268,24 @@
 eg. $\tt OB\_Jnorth(3)=-1$  means that the point $\tt (3,Ny)$ 
 is a northern OB.
 
+\noindent\textbf{Simple examples:} For a model grid with $ N_{x}\times
+N_{y} = 120\times144$ horizontal grid points with four open boundaries
+along the four egdes of the domain, the simplest way of specifying the
+boundary points in \code{data.obcs} is:
+\begin{verbatim}
+  OB_Ieast = 144*-1,
+# or OB_Ieast = 144*120,
+  OB_Iwest = 144*1,
+  OB_Jnorth = 120*-1,
+# or OB_Jnorth = 120*144,
+  OB_Jsouth = 120*1,
+\end{verbatim}
+If only the first $50$ grid points of the southern boundary are
+boundary points: 
+\begin{verbatim}
+  OB_Jsouth(1:50) = 50*1,
+\end{verbatim}
+
 \noindent
 \textsf{Add special comments for case \#define NONLIN\_FRSURF,
 see obcs\_ini\_fixed.F}
@@ -279,7 +297,7 @@
 
 \paragraph{OBCS\_READPARMS:} ~ \\
 Set OB positions through arrays
-{\tt OB\_Jnorth(Ny), OB\_Jsouth(Ny), OB\_Ieast(Nx), OB\_Iwest(Nx)},
+{\tt OB\_Jnorth(Nx), OB\_Jsouth(Nx), OB\_Ieast(Ny), OB\_Iwest(Ny)},
 and runtime flags (see Table \ref{tab:pkg:obcs:runtime_flags}).
 
 \paragraph{OBCS\_CALC:} ~ \\