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. 2011 Mar 19;18(Pt 3):527–529. doi: 10.1107/S090904951100344X

Figure 4.

Figure 4

Schematic demonstrating the amount of foil fluorescence entering I 1 in the horizontal plane from any point of fluorescence (PoF) along the line of fluorescence. L s = length of Soller slit blades. D s = distance between Soller slit blades (S1 + S2). D I = distance from foil to I 1 (L s + X 1 + X 2). X 1 = distance from foil to Soller slit. X 2 = distance from Soller slit to I 1. P H = horizontal projection onto I 1. Since P H = C 1 + C 2, and C 1/S 1 = C 2/S 2 = D I/(D I − X 1), then P H = D I D S/(D I − X 2).