hi all,

i have to plot some information on the x and y axis.
on the X axis i have the 'no. of threads'
on the Y axis i have the 'no. of prime numbers generated by those threads'

this is easy to plot but the problem im having is to plot the highest and lowest values of those with symbols such as 'X' as the Fastest and '+' as the slowest on the graph..

below is the graph i've generated from the information
Capture.PNG
I want to get rid of the green and red lines and replace them with 'X' and '+' respectively just at the points 1 to 10. I don't need them to be connected just as long the x and + show up.

This is what i'm asked to do.!
A plot of your results, with the number of primeRunners on the x-axis, and
the number of primes computed on the y-axis. Use “X” marks for data from
the fastest primeRunner, and “+” marks for data from the slowest
primeRunner.