Single-survey maps in Galactic coordinates for the 857-1 detector. Top: Survey 1 map. Middle: Survey 2 map. Bottom: Survey 2 minus Survey 1 difference map. This bottom image shows the zodiacal emission and the residual Galactic emission effects that are discussed in the text. The units are MJy sr^-1, assuming a spectrum inversely proportional to frequency. Undefined pixels are shown in grey. These occur in pixels that either have not been observed during the survey, were observed during the passage of a planet, or for a small number of other events. In the top two plots, pixels that were observed over periods longer than a week were not masked, and thus the masked regions are smaller in the top two images than that in the difference (bottom) panel. The units are MJy/sr.