Each folder is a friction sound model and contains the following files:

envs.matrix - the amplitude spectra, or "envelopes"
speeds.vector - the sliding speeds corresponding to the spectra, in meters/sec.

Example Matlab Usage (make sure the given M files are in your path):
A = cc_matrix_read('envs.matrix');
ss = read_vector('speeds.vector');

Now, A(i, f) is the amplitude of the Fourier transform coefficient for frequency bin f and speed sample i. The audio rate is 96khz, and the FT is done with 20 bins. ss(i) gives the speed (m/s) for that sample.
