The files, other than this README.md, are explained below. For further details, refer to the paper.

DMWEL_calculations.nb is the main Mathematica notebook. If not already set up, you will need to configure MaTeX - see http://szhorvat.net/pelican/latex-typesetting-in-mathematica.html - to draw the figures.

dmwel_data.data is a supporting datafile, which is used to avoid repeating long calculations. Ensure that it is put in the same folder as DMWEL_calculations.nb.

All the calculations and data are generated by DMWEL_calculations.nb, except for the CMB anistropy calculations made in ExoCLASS. These are done as follows.

The Python files common.py and model.py should replace the corresponding files in the ExoCLASS's /DarkAgesModule/DarkAges/, for example in the version https://github.com/lesgourg/class_public/tree/42e8f9418e3442d1ea3f26ff84dc9f0e856a0f1d

The Jupyter interactive Python notebook dmwel_chi_and_fc.ipynb and the associated data file ftabPython.data (which was generated by DMWEL_calculations.nb) should be put in ExoCLASS's /notebooks/.

To run ExoCLASS, I used Ubuntu in Windows 10 to run Jupyter, and on Jupyter opened and ran dmwel_chi_and_fc.ipynb, using a Python 2 kernel.