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Figure 2
Illustration of gradients of eight neighbours. Blue solid lines represent gradients of four neighbours, and blue solid lines and blue dotted lines on the diagonal represent gradients of eight neighbours. Here, east (E), west (W), south (S), north (N), southeast (SE), southwest (SW), northeast (NE) and northwest (NW) denote eight directions.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 5| September 2018| Pages 1450-1459
https://doi.org/10.1107/S1600577518009219
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