Figure 2.2: The distribution of the parallax factor sin Ω∗ sin ξH over ecliptic latitude.
Green shows the average concentration, red the highest, and blue the lowest. Black
idicates no values found. Near the ecliptic poles the parallax factor is always close
to the maximum or minimum value, while zero values can be reached for b between
±47◦ . The zero values that cover the entire range of latitudes are due to Sun-pointing
mode data sets.