Fig. 5: Graphical representation of the procedure to derive the structure factor from experimental data.
From: Tetracarbonates in silicate melts may be at the origin of a deep carbon reservoir in the deep Earth

The background signal (in red) is subtracted from the sample signal (in black) and the difference is the structure factor S(Q) (in blue). The selected signal was acquired at 46 GPa, while the background was measured at 1 bar using the same gasket, thus same distance between the diamonds, after the sample has been decompressed, removed, and the gasket cleaned in ultrasonic bath.