Hi Peter,
    If you check the file JGMSS_main.m, you may find the relevant code for reading data. Actually, individual mean time series can be loaded at the "%load mean time series" part. Specifically, given that you have 20 subjects, input data, i.e. mean individual time series, are represented by variables I1, I2, ..., I20. Hope it helps!
    Please feel free to let me know if you need any helps!
    Thanks!

   Xiaoyun