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Figure 5
Directional derivative components of fx and fy: (a) [\nabla_x\,f_x], (b) [\nabla_y\,f_x], (c) [\nabla_x\,f_y] and (d) [\nabla_y\,f_y]. The scale is dimensionless as it corresponds to a variation of pixel size per pixel.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 4| July 2015| Pages 886-894
https://doi.org/10.1107/S1600577515005433
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