Gnuplot - draw a vertical line from the x-axis to the plot, and from the plot to the y-axis

I have a Gaussian curve drawn via gnuplot and I want to have a line which goes up from the x-axis, stops exactly where it hits the curve, and goes perpendicular to the left to hit the y-axis, ideally displaying the values at both axis, and displaying a symbol where it intersects with the x-axis.

What is the right way to add this in gnuplot? I tried to play around with arrows using nohead but I am a newbie to gnuplot and can't seem to find a way to achieve what I need.