Connecting Vertical Points in a plot

I have plotted an average y-value along with a minimum and maximum y-value. They are all three plotted at the same x-value. Representing a maximum and minimum range around the average point for that specific x-value. How can I vertically connect these three points so it appears as more of a range instead of three vertical points?

I have attached a picture in case my wording is not clear.

Thanks guys, Chase

[Chase Lucia]

I need to connect the square to its respective range, the circle to its respective range, and finally the triangle

Answer 1

[Star Strider]

One possibility:

figure(1)
plot([1 1], [0.5 0.8], [2 2], [3 4], [3 3], [1 2])
axis([0  4    0  5])

Another is the errorbar function.