Gnuplot asymptotic line
<p>How can I fit a vertical asymptotic line to show (in the graph bellow) which is the maximum point in the x-axis?</p>

<p><a href="http://i.stack.imgur.com/axtcJ.png" rel="nofollow">graph</a> </p>

<p>Here is the plotting code:</p>

<pre><code>set parametric

set trange [0:pi]

a(t) = (1 + cos(t))/2

t1(t) = (t + sin(t))/2
R(t) = a(t)

rho(t) = 1/R(t)**3

rho2(t) = log(rho(t)/rho(0))

set xlabel "t"

set ylabel "log(rho)"

plot t1(t), rho2(t)
</code></pre>