1In some particular cases, soft condensed materials (e.g. polymers) can be altered by the X-rays, but the technique remains essentially non-destructive for most of the materials science samples.
2The pixel size was also checked by a calibration procedure during the experiment. A value of 0.68 µm was found.
3A point or area detector can be used; in this last case the integrated intensity over the whole detector or only part of it (a region of interest) can be used as a probe for the contrast.
4In fact, the two peaks cannot be distinguished, especially in the low-energy resolution pink beam; see also later in the paper.
5The presence of the resist used for lithography can be seen as dark regions on the surface of the sample.