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-rw-r--r--libcrystfel/src/crystal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libcrystfel/src/crystal.h b/libcrystfel/src/crystal.h
index 3d0ad9d1..8c32a87d 100644
--- a/libcrystfel/src/crystal.h
+++ b/libcrystfel/src/crystal.h
@@ -48,6 +48,7 @@ typedef struct _crystal Crystal;
extern Crystal *crystal_new(void);
+extern Crystal *crystal_copy(Crystal *cryst);
extern void crystal_free(Crystal *cryst);
extern UnitCell *crystal_get_cell(Crystal *cryst);