range xRange = [book1]sheet1!col(1);  // column 1
range yRange = [book1]sheet1!col(2);  // column 2
for(ii=1; ii<[book1]sheet1!wks.maxrows; ii++)
{
	x1 = xRange[ii];  // x coordinate of point one
	y1 = yRange[ii];  // y coordinate of point one
	x2 = xRange[ii+1];  // x coordinate of point two
	y2 = yRange[ii+1];  // y coordinate of point two
	xc = x1+(x2-x1)/2;  // x coordinate of center
	yc = y1+(y2-y1)/2;  // y coorindate of center
	draw -n line$(ii) -lm {x1, y1, xc, yc};  // draw a line
	line$(ii).arrowEndShape = 3;  // add an arrow
	line$(ii).arrowEndWidth = 15;  // set width of arrow
	line$(ii).color = 2;  // set color of line, red
	layer -a;  // rescale the layer
}