Once airborne and climbing, the <a href="https://en.wikipedia.org/wiki/glider" class="extiw" title="en:glider">glider</a> can fly one of two tow positions. High tow is <a href="https://en.wikipedia.org/wiki/aerotow" class="extiw" title="en:aerotow">aerotow</a> flight with the glider positioned above the <a href="https://en.wikipedia.org/wiki/Wake_turbulence" class="extiw" title="en:Wake turbulence">wake</a> of the <a href="https://en.wikipedia.org/wiki/towplane" class="extiw" title="en:towplane">towplane</a>. Low tow is aerotow flight with the glider positioned below the wake of the towplane. [Figure 7-6]
U.S. Department of Transportation, Federal Aviation Administration, Flight Standards Service
2013
FAA-H-8083-13A <i>Glider Flying Handbook</i>, 2013 edition, p. 7-7, Figure 7-6