arr;</a></td>
	</tr>
	</table>
	<h2>
An arctangent scale plot example
	</h2>
	<form>
	<div style="margin-bottom: 12pt;">
	The scale:<br>
	<input type="radio" name="scale" id="scale_1" value="A" onInput="draw_canvas()"checked="true"><label for="scale_1">Linear</label><br>
	<input type="radio" name="scale" id="scale_2" value="B" onInput="draw_canvas()"><label for="scale_2">Arctagent</label><br>
	</div>
	<div style="margin-bottom: 12pt;">
	<i>F(x)</i>:<br>
	<textarea id="f" onInput="draw_canvas()" rows=3>exp(x