• After reading in the data, < 4 sigma data can be elliminated from the refinement in Crystals by the following commands:

  \list 28
  minima ratio=4
  end

  If you wanted to elliminate < 3 sigma data, you would use the following commands:

  \list 28
  minima ratio=3
  end

In the latest Crystals, the above can be peformed via the menu using Refinement, Omit Reflections