 you want to play with an argument values. So you can give a variable name instead of a fixed value. Then the projection will not be performed, and you will be asked at the console to define the variable. When it's done, just click on <B>redo</B> to perform the projection.)<BR><BR>  
There is one special syntax available here, but first let's see the other buttons:<BR><BR>
<B>Second line</B>:<BR>
The result of the projection is a ligne. It will be indexed and stored in an internal list. Items from that list