Helical parameters Load image / Display options Adjst. [+] Search[+] Opts [+]
P(Å):
radius(Å):
p(Å):
θ°:
P/p=u=
units/turn
c ≅
twist=°
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CX:
CY:
ΔX:
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X:
Y:
Pixel(Å):
γ°:
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P
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SYMMETRY SEARCH RESULTS:
TOP SCORES / RANGES:
↑Pitch
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HELIXPLORER helps with the determination of helical symmetry parameters. The tool supposes you have at your disposal the diffraction pattern (Fourier transform) of an helical structure.

HELIXPLORER draws the theoretically expected pattern calculated from an ideal helix on the top of your experimental diffraction pattern.

It then calculates a score based on the average pixel value in the areas which should contain the maxima of the pattern.

The obtained scores will then be plotted for all tested helical parameters as 1D or 2D graphs that you can click on to check the agreement between the experimental and theoretical patterns.

Hopefully, the plots will show a maximum score for the true helical symmetry parameters of your structure. Of course, there will be ambiguities and the maximum score will not always be unique but HELIXPLORER should help with selecting a manageable subset of possibilities. Good luck and enjoy…