I found some airfoil coordinates I downloaded and stored in 1994, and they have an SOF file extension. It is the classic top coordinates on the left and bottom coordinates on the right, nose to tail, as seen in the below excerpt from the Eppler 197. I can't find any references to SOF, so if anyone happens to know what it is, please pass it on. Thanks,

- Erik

E197
31
0 0
.00318 .00789
.01104 .01683
.02335 .02633
.03996 .036
.06075 .04556
8.550999E-02 .05478
.11402 .06345
.14599 .07139
.18112 .07844
.21902 8.442001E-02
.25933 .08918
.30159 .0925
.34551 .09413
.39085 .09394
.43735 .09191
.48474 .08806
.53282 .08246