INT NSTracker_SF_Index "Index of the sperical surface which should be moved around" STEERABLE=always
{
  -1:* :: "-1 to disable (default), >=0 index of the moved spherical surface"
} -1

STRING NSTracker_SF_Name "Name of the sperical surface which should be moved around" STEERABLE=always
{
""   :: "use NSTracker_SF_Index"
".*" :: "any string"
} ""

INT NSTracker_SF_Index_Opposite "Index of the sperical surface which should be moved around, at (-x, -y, z) where (x,y,z) is the location of NSTracker_SF_Index" STEERABLE=always
{
  -1:* :: "-1 to disable (default), >=0 index of the moved spherical surface"
} -1

STRING NSTracker_SF_Name_Opposite "Name of the sperical surface which should be moved around, at (-x, -y, z) where (x,y,z) is the location of NSTracker_SF_Index" STEERABLE=always
{
""   :: "use NSTracker_SF_Index_Opposite"
".*" :: "any string"
} ""

CCTK_REAL NSTracker_stop_time "Time after which to stop updating the SF" STEERABLE=always
{
  * :: "positive, negative values disable this feature (default)"
} -1

CCTK_REAL NSTracker_max_distance "Maximal distance the maximum is allowed to move before discarding this value" STEERABLE=always
{
  * :: "positive, negative values disable this feature (default)"
} -1

BOOLEAN NSTracker_verbose "Turn on verbose messages, default no" STEERABLE=always
{
} "no"

CCTK_STRING NSTracker_tracked_location "name of grid scalar group containing coordinates of center of star"
{
  "^Hydro_Analysis[:][:]Hydro_Analysis_rho_max_loc$"                     :: "location of maximum"
  "^Hydro_Analysis[:][:]Hydro_Analysis_rho_core_center_volume_weighted$" :: "center of mass of core region"
  "^.*[:][:].*$"                                                         :: "any valid grid scalar name"
} "Hydro_Analysis::Hydro_Analysis_rho_max_loc"