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-rw-r--r--doc/man/crystfel_geometry.52
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/man/crystfel_geometry.5 b/doc/man/crystfel_geometry.5
index 04a3aad9..ce06181a 100644
--- a/doc/man/crystfel_geometry.5
+++ b/doc/man/crystfel_geometry.5
@@ -112,7 +112,7 @@ The camera length offset (in metres) for this panel. This number will be added
.IP \fBfs\fR
.IP \fBss\fR
.PD
-For this panel, the fast and slow scan directions correspond to the given directions in the lab coordinate system described above, measured in pixels. Example: "panel0/fs = 0.5x+0.5y".
+For this panel, the fast and slow scan directions correspond to the given directions in the lab coordinate system described above, measured in pixels. Example: "panel0/fs = 0.5x+0.5y". Note that (in the current version) the directions must be perpendicular to the beam direction, i.e. contain components in the x and y directions only.
.PD 0
.IP \fBcorner_x\fR