Minimum observable flux density depending on elevation and location of the radio source in the Galaxy for a S/N of 5 and an observation duration of 4h. Three different Galactic temperature and location are used. Blue: Galactic centre (gl = 0°, gb = 0°, T_sky = 50 000 K); green: Galactic plane (gl = 90°, gb = 0°, T_sky = 8500 K); red: and outside the Galactic plane (gl = 0°, gb = 90°, T_sky = 2350 K). Pulsars with flux densities in the colored region are too faint, and thus undetectable for the LBA antennas of the LOFAR station FR606.