these ones:
if mach > 0.0 and mach < 0.68 then
set_aircraft_draw_argument_value(7, 0.0 )
end
if mach > 0.69 and mach < 0.86 then
set_aircraft_draw_argument_value(7, 0.5 )
end
if mach > 0.87 and mach < 3.0 then
set_aircraft_draw_argument_value(7, 1.0 )
end