
Thanks for the reply guys. Below are the script and data files.

http://www.nabble.com/file/p24734049/HEAD_calibration.R HEAD_calibration.R 
http://www.nabble.com/file/p24734049/6527-1052 6527-1052 
http://www.nabble.com/file/p24734049/6527-1054 6527-1054 
http://www.nabble.com/file/p24734049/MAR3 MAR3 

Once again, thank you for your help, greatly appreciated!!

Chris


Chris Li wrote:
> 
> Hi everyone. I am new to R.
> 
> It will be greatly appreciated if someone can help me with the following
> questions.
> 
> Here's the graph I have just produced. 
> http://www.nabble.com/file/p24732839/calibration.jpeg 
> 
> (1) How can I put the legend on top of the grid lines?
> 
> (2) How can I match the grid lines with the x-axis ticks?
> 
> (3) How can I change the x-axis format from e.g. Mar, Apr...etc to
> 1-3-2009,1-4-2009...etc?
> 
> Many thanks! :-)
> 
> Chris
> 

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