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M 17, The Swan Nebula (Sgr)
Technical data: 16"f/8-Hypergraph STL6303 with Astronomic filter set IIc HaRGB (Ha (12nm) = 4 x 900s; R and G = 3 x 300s; B = 3 x 600s) Location: Namibia Authors: Bernd Flach-Wilken and Volker Wendel Comment: same data as above, here is the H-alpha channel displayed for itīs own.
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