A
870 version
s_left 	s_right t_bottom t_top
 0	 7	0	196	// comment: IAS 1000
 7	14	0	196	// comment: IAS 100
14	21	0	196	// comment: IAS 10
21	26	3	115	// comment: IAS 1
10				// comment: knots per tickmark (small)
 0				// comment: knots per tickmark (big)
20				// comment: knots per label
 5.0			// comment: pixels per knot
