              Data items in the PHASING_MIR_DER_REFLN category record details\
               about the calculated structure factors obtained in an MIR\
               phasing experiment.\
\
               This list may contain information from a number of different\
               derivatives; _phasing_MIR_der_refln.der_id indicates to which\
               derivative a given record corresponds. (A derivative in this\
               context does not necessarily equate with a data set; see the\
               definition of the PHASING_MIR_DER category for a more\
               thorough discussion of the meaning of derivative.)\
\
               It is not necessary for the data items describing the measured\
               value of F to appear in this list, as they will already have\
               been given in the PHASING_SET_REFLN category. However, these\
               items may also be listed here for completeness, if desired.