Specify coordinates for the search center, and a search radius in arcmin. You may also choose to retrieve only "cool" stars (T ~ 6 x 103 K), only "hot" stars (T > 1.2 x 104 K), or both sets of temperatures.
Please reference Zaritsky, Harris, Thompson, and Grebel, 2004, AJ, 128, 1606 if you use these values in your research and for details of the procedure.