It adds (or subtracts) 2pi to the phase difference between the unkown and the standard as some times it does not eztrapolate to zero as 2k*delta r term should. Anatoly -----Original Message----- From: ifeffit-bounces@millenia.cars.aps.anl.gov To: ifeffit@millenia.cars.aps.anl.gov Sent: Wed Dec 05 06:22:28 2007 Subject: [Ifeffit] Log-Ratio Dear all, i have a question to the Log-Ratio/Phase-Differnce Analysis in Athena. What means the parameter 2pi jump? I did not find any help file for the ratio method. Best regards Jörg Haug _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit