LAYOUT_DOT> Following function keys are defined for DOT mode:
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[SPACEBAR] or [.] or [MOUSE_UNSHIFT_RIGHT]:

     Enter a point at the current cursor location which is then marked 
     with a plus sign. To select entries in a window, enter two points 
     which marks the two opposite corners of the window. To draw a line 
     segment or a polyline or a polygon or a curve, enter the desired 
     number of points. Note: the first point pressed to enter DOT mode
     has been counted. If you press [SPACEBAR] or [.] or [MOUSE_UNSHIFT
     _RIGHT] twice at the same cursor location, the point just entered
     is discarded.

[DELETE] or [,] or [MOUSE_SHIFT_RIGHT]:

     Discard the last point entered. 

[P] or [S]:

     Pick or select layout entries that fall in the window marked by 
     the two corner points entered. If picked, the entries are high-
     lighted in blinking.

[ENTER] or [MOUSE_UNSHIFT_MIDDLE]:

     Connect the line or curve marked by the points entered.
     Before pressing [ENTER], you can optionally press:
     A numeric key [1] to [8] to designate the type of line to connect;
     [<] &/ [>] to attach arrowhead(s) to a line segment, but for a 
     polyline, [<] designates a spline-curve fit and [>] turns on the
     area fill within the polygon.

[RETURN] or [CTRL/Z]: Quit from DOT mode. Points if entered are discarded.
