version: dl2Dv151
compiled: Jun 16  2011, default gcc compiler at Brutus at that time.
random number generator: boost::lagged_fibonacci607
how often do we measure?  - according to the parameter Nmeasure of the code. the raw data is however "prebinned" into the binns of size 1000 before it is saved to the file obs_RGStructureFactorPeriodic.