Can somebody compare how relate IYR (Ishares DJ US Real Estate) to ICF (iShares Cohen & Steers Realty Majors). I thought they are related well each to other (they both have holding of practically the same R.Est. trusts). I am asking this because I noticed that today (12.09.2003) IYR gapped down but ICF not. What happened that ICF is not affected and IYR is ? Thank you for your ideas.