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-rw-r--r--libcrystfel/src/image.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/image.h b/libcrystfel/src/image.h
index 706b06b1..04fb18a0 100644
--- a/libcrystfel/src/image.h
+++ b/libcrystfel/src/image.h
@@ -110,6 +110,8 @@ struct beam_params
char *photon_energy_from; /**< HDF5 dataset name */
double photon_energy_scale; /**< Scale factor for photon energy, if it
* comes from an image header */
+ double bandwidth; /**< FWHM bandwidth as a fraction of
+ * wavelength */
};