A
870 version
s_left 	s_right t_bottom t_top
 0	 0	0	393	// comment: IAS 1000
 0	14	0	393	// comment: IAS 100
14	28	0	393	// comment: IAS 10
28	52	6	230	// comment: IAS 1
10				// comment: knots per tickmark (small)
 0				// comment: knots per tickmark (big)
20				// comment: knots per label
 2.0			// comment: pixels per knot
