How parameters derived from the spot shape (such as mosaic block size and rotation, beam divergence, and crossfire) and their errors were estimated. See the related items section. This can be a written description or a citation to a specific software package that determined these parameters. Note, these parameters are considered derived terms from the data, as opposed to measured terms from the instrument (such as diffrn_radiation.div_x_source, a term similar to pdbx_crystal_alignment.crossfire_x).