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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 16a92102..b9fe8ea4 100644
--- a/libcrystfel/src/geometry.c
+++ b/libcrystfel/src/geometry.c
@@ -674,7 +674,7 @@ static void ginn_spectrum_partialities(Crystal *cryst)
r0 = fabs(crystal_get_profile_radius(cryst));
m = crystal_get_mosaicity(cryst);
lambda = image->lambda;
- sig = image->bw * lambda;
+ sig = image->bw * lambda / 2.0;
for ( refl = first_refl(crystal_get_reflections(cryst), &iter);
refl != NULL;