USEValues E_limit :

This keyword instructs QS to calculate the normalised structure factor amplitudes corresponding to input Fs and --in addition to all other selection criteria-- to select only those reflections for which E_o > E_limit. QS will also write out an ASCII file (with the name Qs_Evalues.hkl) containing h, k, l, F,$\sigma$(F), E where E is the normalised structure factor amplitude corresponding to F. I should add that I still marvel at how I managed to make the E-value calculation so slow.