Looks like the kind of gibberish you get when either the XGterm/Xterm settings are wrong (e.g. using an XGterm window but told IRAF it was an Xterm), or you're using something that doesn't support graphics at all like a gnome-terminal or rxvt. Double check your terminal and settings, a new MKIRAF or an "cl> stty xgterm" or "cl> stty xterm" as appropriate should help.
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