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-rw-r--r--libcrystfel/src/geometry.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/geometry.c b/libcrystfel/src/geometry.c
index 5b2107d1..fc42a8de 100644
--- a/libcrystfel/src/geometry.c
+++ b/libcrystfel/src/geometry.c
@@ -332,7 +332,7 @@ static Reflection *check_reflection(struct image *image, Crystal *cryst,
/* Closest point on Ewald sphere.
* Project zl to 0, bit of a hack... */
- const double zlp0 = zl>0?zl:0;
+ const double zlp0 = zl<0?zl:0;
exerr2 = (x-xl)*(x-xl) + (y-yl)*(y-yl) + (z-zl)*(z-zl);
/* Weighted average between projected lattice point