LAYOUT_DOT> Following function keys are defined for DOT mode:
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[SPACEBAR] or [.]: 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 [.] twice 
     at the same cursor location, the point just entered is discarded.
[DELETE] or [-] or [,]: 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]: 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.
