Hi everyone and Matt

To make the problem happened to me clearer, please import the data 1-4.Dat attached and see the result. The result on my Windows XP SP2 is also attached in name of 1-4.jpg. The case may be different from others.

The IFEFFIT is downloaded from "http://cars9.uchicago.edu/~ifeffit/src/ifeffit-1.2.10.exe".

Wang