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-rw-r--r--libcrystfel/src/datatemplate.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/datatemplate.h b/libcrystfel/src/datatemplate.h
index 22322b57..3d457f80 100644
--- a/libcrystfel/src/datatemplate.h
+++ b/libcrystfel/src/datatemplate.h
@@ -90,6 +90,8 @@ extern int data_template_get_slab_extents(const DataTemplate *dt, int *pw, int *
extern struct rg_collection *data_template_get_rigid_groups(const DataTemplate *dtempl,
const char *collection_name);
+extern double data_template_get_wavelength_if_possible(const DataTemplate *dt);
+
#ifdef __cplusplus
}
#endif