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-rw-r--r--src/diffraction.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/diffraction.h b/src/diffraction.h
index efc59d36..36d1c21f 100644
--- a/src/diffraction.h
+++ b/src/diffraction.h
@@ -23,5 +23,6 @@ extern void get_diffraction(struct image *image, int na, int nb, int nc,
int nosfac);
extern double water_intensity(struct rvec q, double en,
double beam_r, double water_r);
-
+extern struct rvec get_q(struct image *image, unsigned int xs, unsigned int ys,
+ unsigned int sampling, float *ttp);
#endif /* DIFFRACTION_H */