A
870 version
s_left 	s_right t_bottom t_top
 38	36	0	392	// comment: altitude 100000
 14	28	0	392	// comment: altitude 10000
28	42	0	392	// comment: altitude 1000
42	56	0	392	// comment: altitude 100
56	76	12	132	// comment: altitude 10 (20 feet of increment)
50				// comment: feet per tickmark (small)
200  			// comment: feet per tickmark (big)
100				// comment: feet per label
  0.45			// comment: pixels per foot
