The following example shows some particle traces of a simulation of the Falcon aircraft:
m = Model('falcon.mc')
f = Field(m, 'PSLO', cycle=1)
p = NPart(m)
p.contour.field=f
p.faceset.cycle=1
p.faceset.extract=1
tr = Tracer(m)
tr.emitters.append((7000, 5000, -1000.0), size=(0.0, 5000.0, 500.0), num=(1, 4, 1))