 periodic_x                          = .true., .false.,.false.,
 open_xs                             = .false.,.false.,.false.,
 open_xe                             = .false.,.false.,.false.,
 periodic_y                          = .true., .false.,.false.,
 open_ys                             = .false.,.false.,.false.,
 open_ye                             = .false.,.false.,.false.,
