3
# Tom Kepler's model of a stochastic birth
v x1=1.e-4,x2=1.e-4
m z 0 2
p eps=.1,a=1.5
o x1*(1-x1-x2)
o z*(a*x2*(1-x1-x2)+eps*x1)
r z
{0} {eps*x1}
{0} {0}
d