Thanks for your suggestions. Actually sometimes we are not able to frame the question correctly, which is also one of the reason of not getting a response.
The issue is not so much framing a question correctly, but asking a question that can be answered.
To be specific, I had already opened these data file in Athena and had done analysis on them. But when I try to open these data files in SIXPack, column assingment is required. First I tried to open the E, mu(E) format text file, SIXPack asks for column assingment, but there is no column for mu(E). Then I tried E, I0, It data format and I checked the respected column, but still not able to plot the data. Each time it is giving some error in data plotting like background error, plotting error. The data is loading but I am not able to plot it. I think now I had made myself clear for getting some response.
I do not wish to be rude, but as I said before, you really need to ask a question that can be answered. You have not asked a question at all! Perhaps you would want to send a file that is giving you trouble ("How can I read the attached file with SIXPack?"). And again be specific: "giving some error ..." is much too vague to be able to understand what might be happening. Tell us what the error message is. Good luck, --Matt