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-rw-r--r--src/diffraction.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/diffraction.h b/src/diffraction.h
index 5b67c198..e397bd3a 100644
--- a/src/diffraction.h
+++ b/src/diffraction.h
@@ -57,4 +57,6 @@ extern struct sample *generate_tophat(struct image *image);
extern struct sample *generate_SASE(struct image *image, gsl_rng *rng);
+extern struct sample *generate_twocolour(struct image *image);
+
#endif /* DIFFRACTION_H */