Example of three hours of data analyzed by the pattern-matching method. The upper figure shows the raw data of ch(0). The middle figure shows the combined SNR of the eight-channel output data. SNR peaks larger than 7 are marked with a small circle; the figures by the peaks are the observed SNR. Peaks with an open circle show the side lobe from strong sources. The lower figure shows the expected flux density of the radio sources listed in the NRAO VLA Sky Survey (NVSS) catalog (Condon et al. 1998) taking account of the difference in the declinations between the source and the antenna position. (Color online)