Fig. 6
Map of the sources (in Galactic coordinates) detected in the BAT survey data. The object class is colour-coded according to the legend. The size of the symbol is proportional to A) the 15–150 keV source flux; B) the hardness ratio obtained as the ratio of the counts in the 35–150 keV band to those in the 15–150 keV band; C) the variability index (as defined in Sect. 5).
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