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Let's take a look at the naca4412.dat file:

{{
256    2   
0    0    0
-0.00019628    0.001241474    0
-0.000247836    0.001759397    0
-0.000275577    0.002158277    0
-0.000290986    0.002495536    0
-0.000298515    0.002793415    0
-0.000300443    0.00306332    0
}}

The first line of the file represents the number of points on each edge (256) and the number of edges (2). The first 256 set of vertices are connected to form the edge corresponding to the upper surface; the next 256 are connected to form the edge for the lower surface.

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