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With B.G.
Without B.G.
Only B.G.
Diff from B.G.
540-860
PNG
Gamma Spectrum - 15061303:500cc, 607g, 多摩川付着藻類2回目
Gamma Spectrum - 15053003:500cc, 698g, 多摩川、付着藻類, weight ratio=0.87