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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 85d06cc2..ed583feb 100644
--- a/src/diffraction.h
+++ b/src/diffraction.h
@@ -32,4 +32,6 @@ extern void get_diffraction(struct image *image, int na, int nb, int nc,
extern struct rvec get_q(struct image *image, unsigned int xs, unsigned int ys,
unsigned int sampling, float *ttp, float k);
+extern double get_tt(struct image *image, unsigned int xs, unsigned int ys);
+
#endif /* DIFFRACTION_H */