    (Times-RomanF) 25 Font
    0.5 mm Pen
    [ 50 550 50 800][ 0 30 -0.5 1 ] Axe2
    [ (0) (10) (20) (30) ] GradX
    [ (-0.4) (-0.2) (0) (0.2) (0.4) (0.6) (0.8) (1.0) ] GradY

    gsave   % save current color pen etc...
        0.15 mm Pen
    	[ Xmin 0 Xmax 0 ] Black 1 Dash Lines
    grestore % restore color pen dash...
    ?
    gsave
    [
    % LC_NUMERIC=C to make sure that "." is the decimal separator
    ! LC_NUMERIC=C ./sinx.awk
    ] Blue Lines
    grestore
    ?
    gsave
    [
    ! LC_NUMERIC=C ./sinx2.awk
    ] 1 Dash Red Lines
    grestore
    300 720
    % beware to escape ( in a postscript string
    ( Blue ) ( sin\(x\)/x ) Label
    ( Red 1 Dash Lines ) ( sin\(x\)/sqrt\(x\) )  Label
    ?