This is nothing else than the definition of point type 7, and this definition is used in the actual plotting of your data, somewhere at the end of the postscript file. This should be somewhere around line 161. Now, that we have the postscript file, open it in any text editor, and search for the line Otherwise, all your consequent graphs will be written to bubble.eps.) Simple enough, isn't it? (Do not forget to reset the terminal, once you are done with the plot. Plot the data points with point type 7 (as a matter of fact, it does not really matter which style you use, but in what follows, I will assume that we have point type 7), and redirect the output to a postscript file, i.e., you would have a gnu script as in So, if you feel a bit adventurous, you could try to see what can be achieved by manipulating the postscript file. This makes it possible to easily change the plot even when it is, in fact, finished in the sense that gnuplot has produced it. One of gnuplot's most appealing features (at least, for me) is that the postscript file it produces is actually human-readable, and quite instructive, not like one that you would see, if you wanted to create the file by re-directing the printer output. For raster images, like png, jpeg and the like, it should not matter. In the next section, I will show how this can be done in a more convenient way, at the price of producing larger postscript files. This is a low-level hack, and is probably not for the faint-hearted. On the following pages, we will discuss three different methods to make a bubble chart. On a presentation slide or a poster, bubble graphs can be quite attractive.

Veusz points