Zscore of weighted Real Space Rfactor for the residue. It is defined as
(wRSR-<wRSR>)/sigma_wRSR, where <wRSR> and sigma_wRSR are for the whole map,
wRSR is for the residue.
Data Type
Data type code
float
Data type detail
float item types are the subset of numbers that are the floating
numbers.