How to plot simple graph?

[maximus tee]

hi,

i'm new to python. i want to read from a text file and i want to plot a scatterplot. i want to plot lane as X-axis, EyVt and EyHt as Y-axis. i'm using Python 2.5 and Win XP.
i have a sample code but i need help on how to get python start reading column Lane, EyVt and EyHt. Pls help. tq

eg of text file content:
Platform: PC
Tempt : 25
TAP0 :0
TAP1 :1

+++++++++++++++ +++++++++++++++ +++++++++++++++
Port Chnl Lane EyVt EyHt
+++++++++++++++ +++++++++++++++ +++++++++++++++
0 1 1 75 55
0 1 2 10 35
0 1 3 25 35
0 1 4 35 25
0 1 5 10 20
+++++++++++++++ +++++++++++++++ +++++++++++++++
Time: 20s

import numpy as np
import pylab as pl

data=np.loadtxt('sampledata.txt')

pl.plot(data[:,0],data[:,1],'ro')
pl.xlabel('x')
pl.ylabel('y')
pl.xlim(0.0,10.)

pl.show()