LineEdit

This button enables an interactive line editor, allows line
segments between points to be added or removed interactively.
When you select LineEdit, if the connecting lines are not
currently being shown, the "Show lines" option is turned on
and the connecting lines are plotted.
(See the help file for the Options button in the main panel.)

The connecting lines can be specified in a startup file named using a
.lines suffix.  The .lines file consists of pairs of numbers on
separate lines, where the pair indicates the row numbers of the
points to be connected, for example:

1 3
1 4
2 5

This button can be activated from the keyboard by typing l or L.

Line colors can be supplied in a file named fname.linecolors,
where fname or fname.data is the name of the data file, one
color per row, where the rows correspond to the rows specified
in the .lines file.
