###########################################################
#
#  Dimensionless Michaelis-Menten Model for substrate s
#  and complex c. On physical grounds
#
#                k2 > k1
#
#  Here
#
#      s = concentration of substrate
#      c = concentration of complex
#
#  Enzyme concentration e = 1-c
#
#
###########################################################
#
#       parameter values defining model
#
p k1=1,k2=4,eps=0.05
#
#       function definitions
#
f1(s,c)=k1*c-s*(1-c)
f2(s,c)=(-k2*c+s*(1-c))/eps
#
#      differential equations
#
s'=f1(s,c)
c'=f2(s,c)
#
#      initial conditions (optional)
#
s(0)=1
c(0)=0
#
#
# Numerical and graphical parameters go here:
#
# (note: dt is too large initially. Must be decreased!)
#
@ total=40,xlo=0,xhi=40,ylo=0,yhi=4,dt=0.05,maxstor=20000
#
d