;  The modelled scattering curves were assessed by calculation of the 
   RG, RSX-1 and RXS-2 values in the same Q ranges 
   used in the experimental Guinier fits. models were 
   then ranked using a goodness-of-fit R-factor 
   defined by analogy with protein crystallography 
   and based on the experimental curves in the Q range 
   extending to 1.4 nm-1.
;