Hey! :o)
This should be simple, but i cant manage: I need to plot many dots with the same x, like

plt.plot([3,3,3,3],[60,80,120,180],'+',markersize=8,mec='k')

The array for x values is silly, especially since the number of y values may be rather large. Is there a way to enter a constant there?

Cheers to you all!
Ulli