import pylab

r0 = int(10e15)
p0 = 1.7e-14
T0 = int(10e7)


r = 10**pylab.arange(5,10,0.01)
P = p0*(r/r0)**(-3)
T = pylab.zeros(r.size);
T[0] = T0
for i in range(1,r.size):
    T[i] = T[i-1]*(1 + (2./3)*((P[i]-P[i-1])/(P[i-1])))

pylab.figure(1)
pylab.loglog(r,T)
pylab.show()