Snapshot of the software for preparing observations for ExTrA. The field of view of one telescope has a diameter of 1^o (gray circle). Each of the five field units (FUs) can be positioned in the part of the focal plane shown with a rectangle of corresponding color. In this figure the field of TOI-269 is shown. Each FU is placed over a particular comparison star (green stars) or the target (red star). On the left the location of each FU is magnified and the fiber apertures are drawn to scale (colored circles; the first circle is 4”, the second circle is 8”). This is used to check if other stars appear near the fibers. In red is the J magnitude of the star, in gray the Gaia magnitude. The guiding star is located at the center and a magnified image is shown on the right. The five arms correspond to the selected stars with their 2MASS J magnitude and Gaia DR2 temperature indicated at the top right of the figure.