The dimension of the vector space spanned by sets of radio-interferometric measurements

∗This work is sponsored in part by DARPA through the ‘Networked Embedded Systems Technology’ program under contract #F30602-01-C-0123, monitored by the Air Force Research Laboratory. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Defense Advanced Research Projects Agency or the U.S. Government.