In this context, the sample-detector geometry is fundamental. As a three-dimensional object with varying local geometry is measured, the local physical and chemical characteristics of the sample affects the measured raw signal. The approach for geometrical corrections of the signals which was applied here does not account for the influence of detector angles in the 𝑥/𝑧 and 𝑦/𝑧 planes, which could possibly introduce a small uncertainty, particularly at larger capillary diameters. Signals obtained from regions closer to the bulky reservoir structures (high and low x-values) are potentially affected by interfering with the solid angle of the detectors ('shadowing' effects).