gn2c.rea
2                      spatial dimension
2                      number of fields
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#    comments
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Box 1   this is the main channel
-320  6                        nelx,nely,nelz for Box)
0  160          1.0          x0 x1 ratio 
-1 -.9 -.5 .0 .5 .9 1       y0...yn
   ,O  ,W  ,W  ,              bc's)
   ,O  ,t  ,t  ,              bc's)
Box 2   this is the channel inflow box
-5   6                         nelx,nely,nelz for Box)
-8 0   .8                   x0 x1 ratio 
-1 -.9 -.5 .0 .5 .9 1       y0...yn
v  ,   ,   ,   ,              bc's)
t  ,   ,t  ,t  ,              bc's)
Box 3   this is above channel inflow box
-5  -4                         nelx,nely,nelz for Box)
-8 0   .8                   x0 x1 ratio 
 1 5   1.25                 y0 y1 ratio 
v  ,SYM,   ,v  ,              bc's)
t  ,I  ,   ,t  ,              bc's)
Box 4   this is below channel inflow box
-5  -4                         nelx,nely,nelz for Box)
-8 0   .8                   x0 x1 ratio 
-5 -1  .8                   y0 y1 ratio 
v  ,SYM,v  ,   ,              bc's)
t  ,I  ,t  ,   ,              bc's)