Figure 8.
Variation in absorption coefficient with the length of the filter for the six samples (each one with different color) studied: 29 mm diameter holder. (a) 9.5 mm, (b) 19 mm, (c) 28 mm, (d) 38 mm, (e) 57 mm, (f) 67 mm, (g) 75 mm, (h) 85 mm.
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