Top panels: photometry in the K_s-band for the overlapping region between tiles b291 and b305 (left), and d003 and d041 (right). Only stellar sources were used in these plots. Bottom panels: astrometric accuracy for the same overlapping regions. The mean values for Δα × cosδ and Δδ are shown in the top left corner. Counting histograms for the distribution are also shown for both axes.