4 Presentation of the data

The survey is presented in two sets of maps, i.e., in equatorial and galactic coordinates. In equatorial coordinates (Epoch 1950) the survey consists of 4 maps (Fig. 1), each covering $+4^{\circ} \leq \delta \leq +65^{\circ}$ and 6 hours in right ascension. In addition to a grid of equatorial coordinates, a grid of galactic coordinates is superposed in each map. In galactic coordinates the survey is shown in 3 maps (Fig. 2). A grid of equatorial coordinates (Epoch 1950) is superposed on the maps. Contour lines correspond to brightness temperature. The contour lines are drawn in 250 K steps up to 6000 K, labelled every 1500 K; from 6000 K to 10000 K in 400 K steps, labelled every 2000 K; from 10000 K to 20000 K in 1000 K steps, labelled every 10000 K; from 20000 K to 66000 K in 2000 K steps, labelled every 20000 K. Arrows on contour lines point towards decreasing temperature. Figure 3 represents the survey in equal-area projection of galactic coordinates. Figure 4 shows a colour coded map of the whole survey in an Aitoff projection of galactic coordinates.