Help needed for sorting the data and plotting graph
 

Hi All,
I am a newbie to the excel world. I have requirement of analysing some
data that I will obtain from symbian profiler. I will be having a .txt
file with values seperated with tabs so that it can be directly open
in excel. In that I have around 25 colums, first being sample interval
and rest are having data. My requirement is to plot a graph against
the sample interval with data from 2 colums. I can specify the column
name for plotting purpose. Once I plot the graph I should be able to
calculate the average value of one series for those interval in which
the other plotted series is crossing some thereshold value.
Can any body help me...
Thanks and regards,
SPV