public ReadOptions withSep(String sep) {
        setSep(sep);
        return this;
    }
<p>
The file's field separator.
</p>

@param sep
       The file's field separator.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-omics/src/main/java/com/amazonaws/services/omics/model/ReadOptions.java