http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/6-1-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/6-2-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/6-3-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/7-1-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/7-2-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/7-3-4.spk.txt.bz2
http://potterlab.bme.gatech.edu/development-data/simple-text/daily/spont/sparse/7-4-4.spk.txt.bz2