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-rw-r--r--libcrystfel/src/detector.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/detector.c b/libcrystfel/src/detector.c
index 41ebcc9a..37328e5f 100644
--- a/libcrystfel/src/detector.c
+++ b/libcrystfel/src/detector.c
@@ -365,7 +365,7 @@ void record_image(struct image *image, int do_poisson)
ys = (x-p->min_fs)*p->fsy + (y-p->min_ss)*p->ssy;
rx = (xs + p->cnx) / p->res;
ry = (ys + p->cny) / p->res;
- dsq = sqrt(pow(rx, 2.0) + pow(ry, 2.0));
+ dsq = pow(rx, 2.0) + pow(ry, 2.0);
/* Projected area of pixel divided by distance squared */
sa = proj_area / (dsq + Lsq);