These are 3 SRFLP instances introduced in: Amaral, A.R.S., Letchford, A.N. 2011. A polyhedral approach to the single row facility layout problem. Technical Report. Department of Management Science, Lancaster University, U.K. http://www.optimization-online.org/DB_FILE/2008/03/1931.pdf The instances have the following characteristics: Instance_1 n=110, lengths in (7,23) and flows in (0, 100) Instance_2 n=110, lengths in (5,14) and flows in (0, 100) Instance_3 n=110, lengths in (3,7) and flows in (0, 5)