Parameters | Expression Parameters | Replace lowest values

Replace lowest values
Check this box to specify the option to replace the lowest values.
Use additional parameters (Value to Use to Replace Lowest Values, Replace intensities falling below this Column Percentile, Replace intensities falling below this value, and Replace intensities falling at least this many Standard Deviations below the Column Mean) to specify both the conditions under which low values are to be replaced and the values that they are to be replaced with.