Distribution of clusters projected onto the Galactic XY-plane: blue crosses – 231 MWSC open clusters with | b | > 15° from Paper II, red open circles – 139 new open clusters from Paper III, black open squares – 63 newly confirmed open clusters (this paper). The dashed spirals indicate the local spiral arms (magenta, first and third from top: perseus arm; cyan, second and fourth from top: Sagittarius arm) as defined by COCD clusters (Piskunov et al. 2006).
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