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Figure 2
The pyFAI calibration window: manual peak picking and ring assignment can be performed though it. The data correspond to a lanthanum hexaboride (LaB6) calibrant on the Cristal beamline at Synchrotron Soleil taken at 18.57 keV on an Xpad S540 flat pixel detector tilted vertically by about 15°. This detector presents large (vertical) gaps between modules, explaining the incomplete arcs of rings a, b and d. Extracted control points are marked with dots, one colour per group (assigned to a letter), and the fitted iso-[2\theta] contours are overlaid as dashed lines (red, orange and yellow coloured). The iso-[2\theta] contour plot is not smooth because of gaps in the detector, explaining the incompleteness of some rings.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 48| Part 2| March 2015| Pages 510-519
doi:10.1107/S1600576715004306
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