If you really want a screen dump, `xwd | xpr' will produce one in PostScript form. (Type `man xwd' and `man xpr' for details on options.) Another way to do this, if xpr is not available, is `xwd | xwdtopnm | pnmdepth 255 | pnmtops'. If your printer is not a PostScript printer, you can still print the output of either of these commands using Ghostscript, a freely available PostScript interpreter.
Why settle for a screen dump, though? In most cases, you will prefer to use `pschart' to produce a much nicer plot, and in much less time. Select Print from WAVE 's menu to print the current contents of the signal window; use in the Analyze window if you wish to specify start and stop times. See pschart(1), in the WFDB Applications Guide for information about pschart's numerous formatting options. If you don't like the defaults, change them by editing WAVE 's menu file. Doing so also allows you to change the default format for the Print choice on the menu; see the comments in the menu file for details).
If you are plotting a great deal of data, you may wish to use psfd rather than pschart; to do so, select rather than in WAVE 's Analyze window. Most of pschart's options are accepted by psfd.
If you need to collect a set of figures, either from a single record or from many records, use WAVE 's Log window to record the times of interest, and enter captions for each figure in the Description field of the Log window. The log file generated in this way can be interpreted directly as a command file by pschart, which prints the captions as titles for each figure.