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-rw-r--r--interface.ccl6
1 files changed, 6 insertions, 0 deletions
diff --git a/interface.ccl b/interface.ccl
index 03af59d..833b7e3 100644
--- a/interface.ccl
+++ b/interface.ccl
@@ -8,6 +8,12 @@ IMPLEMENTS: SphericalSurface
PUBLIC:
# To be defined by the setting thorn.
+# Suggested meanings:
+# zero: The surface data are invalid (garbage)
+# one: The surface data are valid in principle, although they may be outdated
+CCTK_INT sf_active[nsurfaces] TYPE=scalar
+
+# To be defined by the setting thorn.
# Suggested meanings:
# zero: No surface is provided at this time step
# negative: No surface could be found at this time step