An example of a typical airfoil data file which is in the bottom-surface first order. Note that the first line is the airfoil name and subsequent lines are the coordinates. In this case, the coordinates start at the trailing edge, progress along the bottom surface to the leading edge, and then continue along the top surface back to the trailing edge. It is also acceptable to have the coordinate points in a top-surface first order.

There are no blank lines and no non-numeric data anywhere except in the first line.

NACA 747a315
 1.00000       0.00000
 0.94996      -0.00405
 0.89984      -0.01097 
 0.84962      -0.01915 
 0.79927      -0.02743 
 0.7487       -0.03502 
 0.69759      -0.0411 
 0.64634      -0.04509 
 0.59565      -0.04772 
 0.54537      -0.0493 
 0.49553      -0.05014 
 0.44625      -0.0504 
 0.398        -0.0502 
 0.34999      -0.04926 
 0.30133      -0.04773 
 0.25242      -0.04546 
 0.20332      -0.04247 
 0.15401      -0.03843 
 0.10442      -0.03304 
 0.07947      -0.02952 
 0.05436      -0.02518 
 0.02891      -0.01927 
 0.01589      -0.01473 
 0.01051      -0.01207 
 0.00771      -0.01031 
 0.00000       0.00000 
 0.00229       0.01305 
 0.00449       0.01599 
 0.00911       0.02065
 0.02109       0.02935 
 0.04564       0.04264 
 0.07053       0.05286 
 0.09558       0.0614 
 0.14599       0.07497 
 0.19668       0.08503 
 0.24758       0.09242 
 0.29867       0.09731 
 0.35001       0.09982 
 0.402         0.09962 
 0.45375       0.09572 
 0.50447       0.08964 
 0.55463       0.08206 
 0.60435       0.07324 
 0.65366       0.06365 
 0.70241       0.05354 
 0.7513        0.04336 
 0.80073       0.03295 
 0.85038       0.02257 
 0.90016       0.01289 
 0.95004       0.00481 
 1.00000       0.00000