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-rw-r--r--src/diffraction.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/diffraction.h b/src/diffraction.h
index ca4e3bde..0f95f83c 100644
--- a/src/diffraction.h
+++ b/src/diffraction.h
@@ -60,4 +60,7 @@ extern struct sample *generate_SASE(struct image *image, gsl_rng *rng);
extern struct sample *generate_twocolour(struct image *image);
+extern struct sample *generate_spectrum_fromfile(struct image *image,
+ char *spectrum_fn);
+
#endif /* DIFFRACTION_H */