A
870 version
s_left 	s_right t_bottom t_top
 22	22	0	392	// comment: IAS 1000
 14	28	0	392	// comment: IAS 100
28	42	0	392	// comment: IAS 10
42	55	3	230	// comment: IAS 1
5				// comment: knots per tickmark (small)
10				// comment: knots per tickmark (big)
20				// comment: knots per label
 3.0			// comment: pixels per knot
