Data items in the ARRAY_INTENSITIES category record the information required to recover the intensity data from the set of data values stored in the ARRAY_DATA category. The detector may have a complex relationship between the raw intensity values and the number of incident photons. In most cases, the number stored in the final array will have a simple linear relationship to the actual number of incident photons, given by _array_intensities.gain. If raw, uncorrected values are presented (e.g. for calibration experiments), the value of _array_intensities.linearity will be 'raw' and _array_intensities.gain will not be used.
_array_intensities.array_id ARRAYID _array_intensities.binary_id BINARYID _array_intensities.details DETAILS _array_intensities.gain GAIN _array_intensities.gain_esd GAINESD _array_intensities.linearity LINEARITY _array_intensities.offset OFFSET _array_intensities.scaling SCALING _array_intensities.overload OVERLOAD _array_intensities.undefined_value UNDEFVAL _array_intensities.pixel_fast_bin_size FBINSIZE _array_intensities.pixel_slow_bin_size SBINSIZE _array_intensities.pixel_binning_method METHOD --> /CBF_diffrn_scan__SCANID:NXentry /data:NXdata /data--> /CBF_diffrn_scan__SCANID/instrument/CBF_diffrn_detector__DETECTORNAME/data_ARRAYID_BINARYID /instrument:NXinstrument /CBF_diffrn_detector__DETECTORNAME:NXdetector /data_ARRAYID_BINARYID=DATAARRAY @CBF_array_id="ARRAYID" @CBF_binary_id="BINARYID" @details="DETAILS" @gain=[GAIN] @gain_esd=[GAINESD] @linearity="LINEARITY" @offset=[OFFSET] @saturation_value=[OVERLOAD] @scaling_factor=[SCALING] @undefined_value=[UNDEFVAL] @CBF_array_intensities__pixel_fast_bin_size=[FBINSIZE] @CBF_array_intensities__pixel_slow_bin_size=[SBINSIZE] @CBF_array_intensities__pixel_binning_method="METHOD" The argument has been made that these attributes are not needed because NeXus files are supposed to have "true values" stored. In many cases that is true and then none of these attributes are needed. However, with some detectors and some experiments there are good technical and scientific reasons to bring in values that will need processing later to derive "true values", and in those case some or all of these attributes will be needed. They are provided for such cases. The same attributes could be used as fields in the case of a single data array, but in that case links for all the fields would be needed from NXdata to NXdetector, so it is preferable to use attributes even in the case of a single data array. The reverse mapping will support both uses.
loop_ _array_intensities.array_id _array_intensities.linearity _array_intensities.gain _array_intensities.overload _array_intensities.undefined_value _array_intensities.pixel_fast_bin_size _array_intensities.pixel_slow_bin_size _array_intensities.pixel_binning_method image_1 linear 1.2 655535 0 2 2 hardware