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. 2021 Dec 16;3(1):101030. doi: 10.1016/j.xpro.2021.101030

Figure 5.

Figure 5

Determination of helical parameters

(A) Layer line indexing of eNP-2 helical tube, whereas l is the layer line number, n is order of the layer line, blue dashed lines form the reciprocal lattice.

(B) Using the selection rule l=tn+um with input of l and n will yield the results of the number of ASUs (u) in the number of helical turns (t).

(C) Refinement of helical parameters using six different ASU per turn numbers. The red arrow points to the spike-like defects on inner side of the tube. The yellow arrow points to the spike-like defects on outer side of the tube.