The asymmetry spectra measured for Cu-PM at 0.07K and 0.24K can 
be found in the files 0p07K.dat and 0p24K.dat, respectively. These data are
presented in Fig. 1(a) in the manuscript.

The fitting parameters obtain from the fits to the spectra below and above the 
ordering transition can be found in the files below_TN.dat and above_TN.dat, 
respectively. These data are presented in Fig. 1(b) in the manuscript. 

