Folder 'Cu-PM' contains results of the fits to the spectra for the staggered spin chain
material Cu-PM. 
The temperature each set of data was measured at is indicated in the filename.
These data are presented in Figs. 3(c)-3(d) in the manuscript.

Folder 'chiral' contains results of the fits to the spectra for the chiral staggered spin 
chain material [Cu(pym)(H2O)4]SiF6 · H2O. 
The temperature each set of data was measured at is indicated in the filename.
These data are presented in Figs. 3(a) and 3(b) in the manuscript.

For each of these materials, the fitting parameters obtained for fits of lambda against B
can be found in the file fits.txt in the corresponding folder.