This dataset contains 6 folders:

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Folder 1: "Fabrication stream file"

The file "Double_helix_dual_chirality.str" is a text file containing the exposure instructions imported into the electron microscope to perform the exposure. The firest column of this file represents exposure time, the second gives the x position of the beam in pixel units and the third column gives the y position of the beam in pixel units.

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Folder 2: "Micromagnetic simulations"

This folder contains:

 1) File "mumax3_double_helix_v3.exe", this is a copy of the Windows executable employed to perform micromagnetic simulations, this executable was obtained by compiling Mumax3 (version 3.10) as available in the public repositiory (https://github.com/mumax/3/releases) including an extra geometry (the double helix) in the file "shape.go"

 2) File "shape.go", this is the modified file employed to compile Mumax3 and have access to a double-helix geometry

 3) Subfolder "Anti-parallel chirality perversion", this folder contains the simulations resulting from relaxing the union of two double-helices of oppsite chirality in the Anti-parallel arm configuration. This subfolder includes:

	3.1) File: ALBA_2018_v26_AP_all_init.mx3, this is the script employed to simlate the magnetic system
	3.2) .ovf and .vts files: Subset of the states produced by the script (3.1) with names corresponding to the state obtained. The script will produced .ovf files only, .vts conversions are provided to help visualization using other software such as Paraview.
	3.3) Bloch_point.avi, video file with a dynamic rendering of the Bloch point state to help visualization.

 4) Subfolder "Single LH double helix", This folder contains the simulation of the relaxation of a single Left-Handed (LH) double helix, this subfolder includes:
	
	4.1) Two .mx3 scripts for mumax, corresponding to simulations with random and uniform initializations respectively.
	4.2) Two .ovf files corresponding to two of the generated states (anti-parallel and Vortex-like circulation), the original numbering is mantained for reproducibility
	4.3) Two .vts files, which are the conversion of the above .ovf for visualization in Paraview

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Folder 3: "SEM characterization"

This folder contains 5 SEM micrographs of a copy of the structure studied with X-rays at differet angles as described in the Methods.

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Folder 4: "TEM characterization"

This folder contains the 5 TEM images employed to characterize the same structure in detail 

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Folder 5: "XMCD Calibration sample

This folder contains the two processed images employed to calibrate the beamline as described in the methods.

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Folder 6: "XMCD Raw data"

This folder contains the full dataset employed to extract the magnetic state of the structures under study, two subfolders are included for the two states studied (Before and after field exposure)

Each dataset contains three subfolders:
	- Intensity correction, these are images without sample
	- Background light correction, these are images using the sample holder to block the X-ray beam and measure background light
	- Structure transmission, these are images of the nanostructure under study

All images are labelled "-1.6" (for UP) or "-4.2" (for DOWN) to distinguish the two polarizations employed. 

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