## UPDATE LINKS ##

Targets as far north as declination +40°, corresponding to a maximum source elevation at Chajnantor of ~25°, can in principle be observed from the ALMA site, but shadowing by adjacent antennas becomes an increasing problem at low elevations. The imaging capability, as well as the time on source, will necessarily be limited for such northern sources. Shadowing depends on the antenna configuration. Given the short baselines in the ACA configuration, sources with declinations less than −60° or greater than +20° will be subject to significant shadowing. For the 12-meter array, shadowing becomes significant (> 5 %) in the most compact configuration for sources with declination lower than −75° or higher than +25°. For more details, see the Technical Handbook section 7.2 ”Shadowing and beam shape”.